Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae89cea36eb4ee42…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 00:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dd2b42ea55d1673c25de0066667a257 SHA-1: 7d1f9d59477e532bc8dcbb02927c25c09223aaf3 SHA-256: ae89cea36eb4ee42b99e4000424ac1e0ccf91e5b1915eca5c1150aeb60049530
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document exhibits characteristics of a callback phishing lure, prompting users to call a phone number in a context of billing or security issues. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=note+8+charging+port+not+working PDF link annotation
    • http://szyqjsj.com/UploadFile/file/20210908145637642.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/53865755596.pdfIn PDF document text
    • http://gabortech.com/admin/file/wokunezanufevosip.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/tifelisubufavo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/kugakevojel.pdfIn PDF document text
    • https://anaksemut.com/contents/files/welowodukuleve.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161410d62a82d9---dudepaxusifazokab.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/pagirufibobubaxolimuvo.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/datuvubijapidudo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9a91f2af---60883938062.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410ed04a476---20660401471.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e65e691e---73828171330.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/44736155320.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/pqcmi0ghr1nppdqikpshbn47ac/85366030118.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/muxedezin.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/jasiziroje.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/72993179090.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/53080641080.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/g0l076q9vgm4nik6qnc5m9u291/jitanoreparaxupis.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/satekexubagolejafitopu.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/85203992505.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2mittaps2ovf580gjni3nchvg3/tututibunesefajetofov.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pojilokeworirutu.pdfIn PDF document text
    • http://haki.vn/uploads/files/tewuloxajelefuvojaxata.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/brjq4bpmdurf628l01o7qvtflc/80354759898.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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 18596 bytes
SHA-256: 4724325d1c8376d04445f337126c61ba9b1d96e5d55812480deeab4226a0512b
font_01_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 10800 bytes
SHA-256: 50b9ede9e0309deda1c44709edc6815d8273a83b481ac277923f3d2941c33335

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