Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8ed66e4d45d8e8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 18:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 659bcc6f45960b814ce1293f1486c067 SHA-1: 0cd06a260dc0b5ba1e909d4e232b8bbcdf86c277 SHA-256: 0c8ed66e4d45d8e8cad97358b3872bfc66731f5f42f09b4bd27e9e38b2d4f1a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. While no scripts were directly extracted, the presence of numerous embedded URLs, some hosted on compromised CMS platforms, suggests an attempt to redirect the user to malicious content or facilitate further exploitation. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristic findings strongly point to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://akwarella.pl/user_uploads/file/nukobibawosova.pdf In PDF document text
    • http://ji-tien.com/userfiles/file/65927213433.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132480c1a7a0---tozegewazadopefu.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/10170864472.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/bifofukinupeweluz.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/zufaw.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/nobiwabakesivifivo.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/92066177599.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73a5cdcf2---70949022732.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/saniv.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/bisoxodunul.pdfIn PDF document text
    • https://cityface.cz/res/file/wonerisebakigodifugijuku.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/73593755589.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/42935725807.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/85543227376.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/48069431784.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/83488215806.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/lumaxojuxawewedazijos.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hfde9r84v2k3a3vsppueoo79p5/nazuzixozojawubos.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/43813090875.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/fiwugewepefusemuliguneja.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a7523d1ce3d931ad434b134ab655e512/2373624165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=redmi+9+battery+drain+testPDF 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_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 10708 bytes
SHA-256: 1b10d206fa41571a61e495180e34b448b94fea60f04d9bd2c0dca075324931b6
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 17560 bytes
SHA-256: 7af9ee41c02dad3607237ad74fab0aaef3b4ed4cd52df963f32cdaa66751e0da

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