Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a0edb1b8956746…

MALICIOUS

PDF

74.5 KB Created: 2021-08-05 08:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9fd2b5f0871dc95c1dd8aebc8d7b7e1c SHA-1: b747dd8d421b1f10c66777a65ceddf4e8492e0e0 SHA-256: d9a0edb1b89567462c0db8bfcef24571d1edd1ca94c44461f83b27943248b599
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bvhsvq2sdsiku6qoo5vrlefil3/dorigeferugogonudi.pdf In PDF document text
    • https://beaszemin.com/files/14027029405.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/53062959725.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/gifagulojijere.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/115vsrfkovu9ih8b6bnd1tc0u7/30352266922.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7e5411295f28267bb9cb2de2d0c7a054/sejemotomevuwikuka.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/4358289779.pdfIn PDF document text
    • http://benrassam.com/uploads/files/viromevuzijuxopube.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7d3c087c60115ba83ba44ebdadd16e69/tekepifonorubog.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a53733ec57a40c50fcd1c70b2a1e7651/gexidar.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/zokatuzaleja.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/28513482671.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/12ffaf63e4b0db5cfb16856c69363274/31779123344.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/44074630183.pdfIn PDF document text
    • https://beaszemin.com/files/48504125808.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/pg1iuoa5m8l7meura9nh25ucqj/26007044639.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97b5da00e---77866102876.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/10042267006.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160dccf652d9e9---seporuxebabunedexurip.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/kuzij.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/jarizuje.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/duwawamesewamapimi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e6a7f09e1---20436038999.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/xofulegefe.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/71902032225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=vocabulary+workshop+level+e+unit+12+synonyms+and+antonyms+answersPDF 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_off0000bde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE5 11516 bytes
SHA-256: ded76a658eb8c865a9de7c76e34e4e9f1828c2529bf2e14f7a26c026fb3aad9b
font_01_sfnt_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 15648 bytes
SHA-256: 972f7042de6021ad32a7113b5238fdb39aa71121bc65fd0f7f848e0a95933487
font_02_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1