Malicious PDF — malware analysis report

Static analysis result for SHA-256 d686d3df49eed669…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 01:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 915dd03ac23a0682c0b2a48d91fb88fa SHA-1: 5532e64f47879d3c5aabd74406306782b7f41398 SHA-256: d686d3df49eed6691182b612fab987cce714f4d3dcd27cb31fb4002f57e48d76
212 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external links, many of which point to compromised websites or disposable hosting. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common tactic for social engineering attacks. The embedded JavaScript and link farm suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=forge+hacked+client PDF link annotation
    • http://bulgankhangai.mn/userfiles/files/gobilep.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/33804898358.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/22512789006.pdfIn PDF document text
    • http://zimmerei-possert.at/dudivesovesaf.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/23204406875.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4b14c4dc---68063640246.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/50955472846.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/14421188308.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/91359054786.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/pugexipirugalufe.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/65031144315.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/3357450172.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/68186938797.pdfIn PDF document text
    • http://leguido.net/files/65641247269.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137347f53988---31239864328.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/damesat.pdfIn PDF document text
    • http://prosquash.by/data/95946139699.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf0a270c9---devareku.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021910131482876.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/23289206020.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210912203423.pdfIn PDF document text
    • https://scalping.ir/data/files/file/79172273007.pdfIn PDF document text
    • http://sbcnepal.com/images/file/30517186975.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 10552 bytes
SHA-256: 4fc655e0ca8b245d1e2893a6faec678f1f7a1feef574230431fea7c902df98ee
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 20104 bytes
SHA-256: 6a0a2c7f84efe665094d7e27790fd4f31dd06422d9350f80cd34f41a199d077f
font_02_sfnt_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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