Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10fb64dff12e168…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 18:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27d49642528ec6b36bed212c4890770e SHA-1: 3a0118c773142cda359f80724d70d951ab0232c3 SHA-256: a10fb64dff12e168919b1aafcbde97caf96f5f9c08ef81ae0643414c1003ab9b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed8da62893---36312003854.pdf In PDF document text
    • http://onlinevay.com/upload/files/losujajorunusovobabobu.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/pekiwajiguvopo.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/83433696410.pdfIn PDF document text
    • http://atomleasing.ru/media/File/22423607520.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631145201.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210929175406.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/73835114935.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/26932393916.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d29eb4c11c---93442284457.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c4069c2d38a5531e25d8db3e347f9f1a/19613790793.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161304a1ca6001---levolojan.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/65845516481.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140afbaa5ed6---kalasukuxo.pdfIn PDF document text
    • http://redactron.com/userfiles/file/69347513498.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/fujafad.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8c2fbde9a---82088573983.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/74455248511.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k98ulvcflqntimm3bkt9fnq7f6/nelusamugadajowo.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/31247187573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+screenshot+sc+story+without+them+knowingPDF 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_off0000b07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 10852 bytes
SHA-256: 044c19c96895fd911deb0e762e582f2369045f8337055f7d3db550b8a86af349
font_02_sfnt_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 15728 bytes
SHA-256: 69dcd6d2a5f0b822a190ec2c2a60270ac6d8ee1805ac4519fc959161b2e10cf4