Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd0bc1287a3938e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 06:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 988607440054a9935708e828fd1979e5 SHA-1: 6b407c15c1d27bf876e2210f32c5f7f19a73eefe SHA-256: 7bd0bc1287a3938ec9a1bf599c27dfe5b055b5dfc0fe6b5ff31595c0bdaa2f3f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://bitite.lv/media/txt/122/file/60517319889.pdf In PDF document text
    • http://lamay.de/userfiles/file/putedexel.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/80212715265.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/2547864854.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/tosadigamevavadixudesag.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/95587907748.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/libini.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/febbe57b2be6e992892071c5601fd606/71853882624.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/76943479407.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/gatigofodor.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/seridobevodefipo.pdfIn PDF document text
    • https://limadelimon.com/images/file/17878453428.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/sakoz.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/28007635414.pdfIn PDF document text
    • http://runhouchem.com/upload/files/96467592508.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cb4q7d2nh4k2c71m7cm4f4hgbo/xuxagosikutenemegi.pdfIn PDF document text
    • http://feminella.ro/upload/fck/laxafumotoju.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/31374444986.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/19bdcb34529f4a3f24ba3cdba6dce651/nebumevamenosapi.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/magobujasefupapogadip.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/bofanupolevakifug.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/43058158226.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/jadodurunijuvivisi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371eb8e4d16---51096576359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=factoring+quadratics+by+completing+the+squarePDF 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_off0000c3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DB 17508 bytes
SHA-256: 6a80f241a71e41709e467e9a15da4a88d91834de50fbf34f1b81d7255f199be1
font_01_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 11440 bytes
SHA-256: bb4b4650dd3dcff48e090f104635652810611f93d412eaa6517a98cdad5e882c
font_02_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1