Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e9b53ac7cb0691…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 14:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01a1d7eb0c2736bf4d867ee18e58864c SHA-1: 2eaeccdaa18cda133f6aa9bd56d23cd8b341c5d2 SHA-256: 56e9b53ac7cb0691e942bc0bd2bc513e3f741c0947f0153eac22198708a438cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allasclub.com/campannas/file/posujinodi.pdf In PDF document text
    • http://headlinesdinerla.com/uploads/files/mokinimerunus.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/92fa398ed38c79086ecc3c7d378c5301/guralamuleduxi.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/92593325264.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/bizopaxekobejexekale.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/zidimilusejuzoponubo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/77300145775.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/96691284075.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/zagijizabofumizuseb.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/wogapulamopilejabuz.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823bc34a3ab---797708564.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/fc30497377d91480f85d359d8e1a34f9/46346265172.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b4d5cc49---xeseraperexijajenimofevi.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/52691776723.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/21539355523.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c89be048f---11300323037.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607576ab9041b---logalataxutigejef.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fa8e70278b9bfb1c4eed779058c87cff/fenujitamanisuxameje.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/juterajukuf.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d9c9a767ed0929567e90c05e59d107a1/11345417592.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/pukadefib.pdfIn PDF document text
    • http://hanifeugur.com/image/files/80365309210.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/zoviwexikere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=philharmonie+k%C3%B6ln+saalplan+pdfPDF 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_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 19928 bytes
SHA-256: 3b94950411ba6ecda0b99ea022cbec52dd2b2e6151090599264091dd1a5c8978
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 10972 bytes
SHA-256: c8fa4c620a4f2163af2f86b013fc8b2b0e8ed37cdb3300e97e071c8fb825a1d5

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