Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40bd22a6e8262e5…

MALICIOUS

PDF

106.2 KB Created: 2021-07-21 21:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 52dcb6410c51fb601057d5b3739954ea SHA-1: abf49b9e1f9064678e4f9747878957145f307faf SHA-256: a40bd22a6e8262e5f4beea60bc441aa0b7cc910c93d5f212f8b8b7594a2af5f2
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits multiple indicators of malicious intent, including a high ML classification score and ClamAV detection as a phishing trojan. It employs social engineering tactics such as a visual download button and instructions to enable macros or editing, commonly used to trick users into executing payloads. The document also contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files. No scripts were extracted, but the overall pattern indicates a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d47d24c1d---jorevafakobulebutirovo.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ba33b156a---73839203824.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/41571850971.pdfIn PDF document text
    • http://senn1962reunion.com/clients/2/2f/2fc2c703930c5c120d54ce0350dd22c7/File/2896069087.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2efa64ea1---10542504909.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/kujetolaboxibovipujonu.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/5065466816.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792e130df86---50554862793.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210708_8C4F6C90521B5714.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fijefidagup.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae8bbc5a2---2967539221.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17621e7c5b---rowugenukeluxapazuvogewu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d185963d92---kejozofifepefoberalowe.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/61422617411.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/fefovivukixaro.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/60482551779.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b34ebd9d---maremovujoj.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fefeb16a98a0c71f6c2dfef89789c91a/61444663374.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/h4pk5b7umekkjpfa26dglj5gkf/70372736562.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/43736895057.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/40e0299280a621e624de4be7a053353b/25281189383.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/d6r2bvtfmpqgb7i8pvs05tm9mt/99770411083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+save+fillable+pdf+with+contentPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14107 18496 bytes
SHA-256: 2bdae774342c61b559e48bc670e1e3a784bf7a033f18e820ea79e343cb88fd79
font_02_sfnt_off0001712b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712B 4376 bytes
SHA-256: cb1913e26d0b12e2394468ba1b69e0811c34a5143f1e52fa969ae4585fd486bc
font_03_sfnt_off00018187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18187 10900 bytes
SHA-256: f0561ec9b23c1ec667b757cf3fed9faad714d4febe7278432f82f78c7013092b

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