Malicious PDF — malware analysis report

Static analysis result for SHA-256 7028102979328691…

MALICIOUS

PDF

71.7 KB Created: 2021-09-04 02:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 494bf286c6e448a3b088c8b56f1aedd9 SHA-1: a1c0925b2e06d3257301319b6384c420562b4880 SHA-256: 70281029793286917c6c3b16ab29f57c0a302426003a7b255de92bd3adda2270
156 Risk Score

Malware Insights

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

The PDF document contains a link farm, directing users to multiple URLs hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to click on these links, which are hosted on sites that appear to be compromised WordPress installations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/g1jtmodg73br9ricsa0rm6u39f/56273578396.pdf In PDF document text
    • http://wittymall.com/multimedia/userfiles/file/61407836342.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/jewubefa.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/46016728407.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2662448df2---71156415632.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9eaa76ec704a07c48be4f24dc8302153/folojowafofovesifetafet.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b4f120df9---mebokakotepi.pdfIn PDF document text
    • https://cmoretv.com/userfiles/46386800077.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/46023229159.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/oid81h6tlmiqu45pqm7socsfrs/88313027557.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/45095599951.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/57005201310.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609634d0bba7d---93622870736.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/58402290162.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/33994777942.pdfIn PDF document text
    • http://aven.su/userfiles/file/pivuxa.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e98a44fac---71366755195.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/61635991871.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/75113397515.pdfIn PDF document text
    • https://jurad.eu/files/file/maxowujokalorulowali.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/gojegimodaleruzagafugefe.pdfIn PDF document text
    • https://loctra.net/userfiles/file/lulikimewipiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=consumer+cellular+moto+g5+plus+manualPDF 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_off0000b442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB442 16504 bytes
SHA-256: cba5876502df0a2270df40b43f7d4648a33d6f87fff27b03e74bbceca3156401
font_01_sfnt_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 10888 bytes
SHA-256: 7bd45a9c19a46e0a057e4d694b0230322aeed4b9c21b3d40d5bf0da2b318e7a8
font_02_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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