Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd13d2b22b9bf04…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 18:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 690d74cb43007e0dcb477a23e70b79e4 SHA-1: 9200eed4a0a88697f9a30392cd5028e6939a0e09 SHA-256: cdd13d2b22b9bf04066985ca98618ac0f939d86ed79cb4cec4702f3b5168f26e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users via external links, potentially leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=line+balancing+problems+and+solutions+pdf PDF link annotation
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f5fe725371ea04885e714816950f1bf0/31696563777.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/lazotuwegi.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/lurepaxesaje.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/lamokukidesilixik.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/12331173558.pdfIn PDF document text
    • https://wineart.online/userfiles/file/57583891993.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/fesubijaxakanujaj.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/derovogalavurinepavozo.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/10849257199.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/mixaperonafefaf.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/77340163899.pdfIn PDF document text
    • http://polipack.ru/content/file/samure.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/65716035484.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/gujeputokojejavek.pdfIn PDF document text
    • http://teraval.cz/res/file/58837221406.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/26638921344.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/fumimurageg.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ca46b8a683fda6b1cb999754e44020a8/92980071377.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/kododoxenadudezuka.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/53880694470.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/81216569273.pdfIn PDF document text
    • http://twtime.com/uploads/files/202110031919043619.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zegowima.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7p5kllovgg2dillleql0k5bat1/benenawijavatusu.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_off0000b206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 11160 bytes
SHA-256: d5165b2f3b3cdddc67409fb3a50036ad504e255d7b7faa7a0309a3ebc43973a3
font_02_sfnt_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 14740 bytes
SHA-256: 23d8ed17b30f77ea5b80df5052de66b69ced7c7da6f3ab1257055aabf033cb97

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