Malicious PDF — malware analysis report

Static analysis result for SHA-256 a106ef500721259a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 14:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddbef1d3157ac26c412dd1e596ef6cd5 SHA-1: 2a9d23398dea17a779e7b8a3b49bc7c77884a59b SHA-256: a106ef500721259a85ac5d37aaafd825d28f5f2582ef5e270bda2df6477bb4cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm findings further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134f9c51c260---ladigisobedotuvene.pdf In PDF document text
    • http://china-baby-clothes.com/d/files/88924301697.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/jizema.pdfIn PDF document text
    • http://www.polni.si/Images/files/rutimexuwonolug.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/naxilowinumedaju.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/40996721319.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/navegijidedimevigajal.pdfIn PDF document text
    • http://talesma.com/E/file/motofusabud.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/96290797081.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/3494752825.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojefuxap.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/11488736916.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/vusitiro.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead9a9147c---82601116344.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/napozasexi.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/loxopezefubowu.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/27673747180.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/61466489370.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/rukikig.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a024018439---tekemijofewofexitu.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/18246777979.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/kexafilirizubolurepizis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=smart+tv+cast+premium+apkPDF 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_off0000babc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 10596 bytes
SHA-256: 2c77209222d507969ad3aae14f9397a8f8a0a40808399d4729512b038dd85ef4
font_02_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 18076 bytes
SHA-256: 61bd1231827899a0c057c4162bf1624c909b2261d26a3917f9c242b29ad3c431

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