Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac88809605c1b3f5…

MALICIOUS

PDF

92.6 KB Created: 2021-07-28 08:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87c35394a84dafddc117285a1cc532cc SHA-1: f84edbd9fc475007efc87c777348f2fb7b6135ce SHA-256: ac88809605c1b3f56979ef402242b7879a9876a7b0630939d4a8c81d2712bc71
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting the user to call a number under the guise of a billing or security issue. While no scripts were explicitly extracted, the presence of numerous links to potentially compromised or disposable hosting suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aff99871ab9---godufowuparopemevo.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e2444b48---55904377732.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210529131427.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab8d22e3dd4---rumedorez.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1df445ec3---katojelekavabinutevamo.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/luvifoxab.pdfIn PDF document text
    • https://yellowstonewildlife.com/potinarasometet.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607327a09b3cc---29471653780.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1c54d09d46ca3294b24e89885b3cf6b0/bikubezutovedogafugutal.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9b25f826b423d3290fcd3562f5ec6ad1/994506480.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/o2rpgab3gu8kph66bku2p0e3c5/49852120361.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/64560653836.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c7d764478---kitezopobevabevume.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/34252469736.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/4c4bd85326151c81f32fbea58bb66866/sizusowegimububaf.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/dojujobuxidapimikeleruz.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d69576b1b---getav.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/jojovikoguseduzexi.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1s7oiqk24l9pad5kcc44jlq8sj/30978128313.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210607140800268.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/waburefigemajulokijege.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210616_86589032193C29FC.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/loxejogimuzatif.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5634d270---69549241110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=free+email+list+download+2019+nigeriaPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/wafipejunenisepebi.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_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 11116 bytes
SHA-256: bda45bf94ece61ff95d3f2fee9f19e3b297b3e103dc4c13df0745e9b4e81eeac
font_02_sfnt_off0001344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 17260 bytes
SHA-256: 3181d5e4c2d72cf109a03a68ee4bd3aaef72cb4f08619d9faaa5f9d55faac027

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