Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8aee4bcc827ad95…

MALICIOUS

PDF

70.1 KB Created: 2021-10-04 00:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0ae9aee3e10cdcccfaae351b43b3f5a1 SHA-1: 2e1a034ddcfa3578458e62007291a2cfe2fee8eb SHA-256: a8aee4bcc827ad953161de0245b3a5fa4552be81315456d69d8e93e9d5a14497
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number for fake issues. While no scripts were extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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.
  • 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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142456a913ab---4690439350.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c27b3486625920c6fba2a6c6d2dee063/24775764379.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/dajexapotabojede.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/lobivelepus.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/73099409473.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/48965517323.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/88775011626.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6ekohfm7bks41k0lvkeau04e22/sevisifipob.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144134d4b39e---20459839417.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/dikifonuper.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/31529881061.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/70664437433.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/70628522712.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/9503687189.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/82197272510.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/defenilizaroguzagaxigar.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/77890517464.pdfIn PDF document text
    • http://synfarm.com/upload/files/80524438180.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20211003085127.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/baforosanifivufefow.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33ce6895e---86142099715.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/55949124807.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/jelep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=you+was+like+my+lover+and+my+best+friendPDF 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_off0000af30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF30 15664 bytes
SHA-256: e734c178aa586ac38cfc5b13a541606019c01aeecd1ddaa83ef1204f82054f65
font_01_sfnt_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 11096 bytes
SHA-256: cdeb592a902d6d7c5bb403d35e08fdb7339db36de47824641f4eea8a9bdaa838
font_02_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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