Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe0487f8db74ba5…

MALICIOUS

PDF

76.8 KB Created: 2021-09-23 02:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63b9ac9c9e5bcec2f329ef282abee68f SHA-1: e77cd36dad202e4dc3c7bca25073391d9827e0e1 SHA-256: 7fe0487f8db74ba5e6dcfe3822947b2927e31a7547fb254982259f128d2dfbf5
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting, suggesting a distribution or phishing vector. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/au7jhebgrqmuscd35klkdo6mf5/48813421494.pdf In PDF document text
    • http://tomaszskiba.com/userfiles/file/8033519217.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145498e99ac4---69300675320.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/3530967512.pdfIn PDF document text
    • https://arranridingclub.com/fwd_docs/file/katazazu.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/82997284448.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a9495c46c---sagoxituvulo.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48855508917.pdfIn PDF document text
    • http://446888.top/userfiles/file/51880177262.pdfIn PDF document text
    • https://polytex.de/sites/default/files/38086037439.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/zoxupadigupusato.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/koser.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/lamaxojuzofisoxeb.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/13699271619.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/tikupigemuwi.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/92585661516.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/34355456544.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/tugurakofanule.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fdd52e3e2---5730014697.pdfIn PDF document text
    • http://c-amc.com/upload/files/mokimekejogipoz.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/minexurapidu.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/60890092417.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb96b7e9ed---rikikonebetibeko.pdfIn PDF document text
    • https://granitnet.hu/editor_up/kixoxelavos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+crossover+by+kwame+alexander+pdfPDF 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_off0000c487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC487 17884 bytes
SHA-256: 1f2202f187408f29bad59078d64b6e05efea2808e93bbb0e15035838977cb2b0
font_01_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 11260 bytes
SHA-256: 3df57051bc8395c7e2ee26fa2d1b92b2d11e71a84ef8fdb1ce9d711d2183fd7b
font_02_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1