Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a0c61f12d1ed4f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 05:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 83431056654921c0a6230ddde8e5664f SHA-1: 12ab0b855714ba96c0c804b8f583a5220383b7cf SHA-256: a9a0c61f12d1ed4fccee24ca6ab25d579fedc245cb4c601335692e8e8a175356
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of external URIs and link farms suggests an attempt to redirect the user to malicious sites. The SE_CALLBACK_LURE heuristic specifically points to a social engineering tactic involving phone calls for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://smidgel.ru/uplcv?utm_term=how+to+delete+pop+up+ads+on+android PDF link annotation
    • https://inprovitchile.com/ckfinder/userfiles/files/51642147322.pdfIn PDF document text
    • http://bamor.org/userfiles/file/puvif.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/gofukazo.pdfIn PDF document text
    • https://istanajp.com/contents/files/gometagevusepixuzuloroxep.pdfIn PDF document text
    • https://dm288.com/slicice/file/90555206891.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/gikiwo.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/pemise.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/josukawejilizofewij.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8a33c320---mamir.pdfIn PDF document text
    • http://jinyezi.cn/upload/gufezomiwex.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/82710139493.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/41781861793.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210905_BE9FE4004D03CF89.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/sojejofaja.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/lifodupo.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/19576172626.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16144206382202---nijonotaw.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/5978122210.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/tegugakagujifegenovu.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/79793441185.pdfIn PDF document text
    • https://il-gusto.com/images/file/ditasaguk.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/61e5d2bfc2c7d5b472269aca84d606de/59812827844.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210906121854.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/417387946.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s28kdivc4r6qicnvaueh5b8jtl/famajixaxaxototomifub.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/73374477713.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/93768819879.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_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 10564 bytes
SHA-256: 23cd58f4a43127f1e7a6f51aa7b462e9d966c00054d4e39f26d027bd339e569c
font_02_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 18640 bytes
SHA-256: d4350e3abd6c90ecd74b7595d6d68bc292581a6c7cc0550af8d325cf75d6d0ab

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