Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c0f7bf1d8e8148…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 21:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d5ee8ae26d146af90bef9219cfc3db3 SHA-1: 38414c3f84e03a15f58159427b2244f05b841436 SHA-256: 97c0f7bf1d8e8148451b259508d55be96be0402e9ec7616fc8d9a3af430ee83e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to potentially malicious content. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=disable+wifi+auto+connect+android PDF link annotation
    • http://cameradungphat.com/uploads/files/60183756329.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/girupoputerilo.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/sanariluzesozazodaf.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/p8v4unlvqo47coofiojhdu4l95/44777926832.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/tewemabejedisebil.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/51776722368.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/nevafubonodirabowis.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202192848589609.pdfIn PDF document text
    • https://superchills.com/userfiles/file/31287074515.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/51299154741.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/joxoxipotiwo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc220b22c4---voxora.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/xovuf.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/rejizabumij.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/23445355030.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/62205474738.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/96276424539.pdfIn PDF document text
    • http://cpviettin.com/upload/files/48285292877.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/68117562864.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b08ff9985abc84ec76e7881ea880b4c2/dowimususugu.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/70174279777.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/tafaduvijuviwa.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/vakakugofalikuxizuriw.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/rogevimaju.pdfIn PDF document text
    • 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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 10796 bytes
SHA-256: 821090cc1f606d20f87b38da716eb73d64a19b4673dd754f0ec4a5373aad24bb
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001109d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109D 19488 bytes
SHA-256: 08ef9af3fc2283dad05f22b61b346d6805a0c84ae0d5d53bef91754f2fb0df62

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