Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ea143220fe0675…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 11:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f19562d718ff95d4e0278955fb7070fb SHA-1: c9028dfc5af78bf8be10e565e84ff0973c082d80 SHA-256: 87ea143220fe06757af598ea4f1c4c1cd5513918e592c3a413af926bdf1b8a0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the link farm implies an attempt to redirect the user to a malicious site, likely leveraging a PDF vulnerability or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0b7350e87---32081326611.pdf In PDF document text
    • http://cl-pub.com/files/files/76857969181.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/drr678k434m3su61o0708vin12/6133486485.pdfIn PDF document text
    • https://e-room.co/userfiles/file/47514315732.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613580fdbfb57---93857022998.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/20678005986.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/70521097158.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/71438720996.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///xaron.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/bebarugodabakizireda.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/02e8b7edb2a7bf2f596faa535c28ffe6/ludimogogimixomomip.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/75fd0661e8cc64b18fbc323e8b24e8f2/12989080918.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/nenafegogugapoxanedulega.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/30903728191.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/3402955489.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/xowitujanezezowunexava.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fikemiguromomakone.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/37176090963.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/napebosabenusuwudos.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/daxixug.pdfIn PDF document text
    • http://fruitvita.com/files/files/jebudisak.pdfIn PDF document text
    • https://tele-video.ru/upload/files/92800114927.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/6626357384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=send+number+to+voicemail+androidPDF 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_off0000b5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE07 15356 bytes
SHA-256: cc1c7a4a0beb930c295e6a571f04ceb255ca9c7cbd10ef65cd9c3d4ff2156c6f
font_02_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 10744 bytes
SHA-256: 7399c0053a1c81ec38837db03b3ab06dafae52131e918e687faca44f3211b78e