Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed18a9984f66187…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 10:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 346c317a797dbc3d04f27dd4cf78b230 SHA-1: 52e98f325df624f3f828495739f0970064c00a6a SHA-256: eed18a9984f66187d1e308acb1a20e0055a1eb1202bb7c79f0a19802767e94b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to PDF files hosted on compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the detection suggest this PDF is designed to lead users to malicious content, likely for phishing or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lentes123.com/aym_image/files/sobepobaw.pdf In PDF document text
    • https://somogyplusz.hu/files/senebut.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/nazimog.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/wuniladul.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/wajasapiwujirazawux.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/kixofit.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/87459751568.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16307626711352490775.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363a68abd53---2112831063.pdfIn PDF document text
    • https://tekartltd.com/upload/files/sivopiwubimojakegadisikaz.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0af5295e416f95f1d409aab0931d676d/46392185162.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/11938512055.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/63394643528.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/vususazele.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/60723264487.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/warolodetiwozekotinotaru.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210901173446.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/xubabelevabixemojikimu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ec99d7a29---bosexanubaxijobapakikozo.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/mizukutidobiwulazomune.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300c948d629---tivopozugekolomibilotife.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/popanomimunarefu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132671992589---zejotofoziwu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140c42f178a2---10312663101.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/tevawajidepux.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/mobadude.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/xifidimedagesawebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=drag+and+drop+marker+google+map+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 16608 bytes
SHA-256: df81fb2048fe262500dee5c0c7a1f8d2dc8a4dd6e93d7d7305bba540fc97dbcb
font_01_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 10560 bytes
SHA-256: 62240e2ea83ec7801137b3f5e177216436bf368a6cd02093f37a23f50309ef6b

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