Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe32503d18a9a88…

MALICIOUS

PDF

82.0 KB Created: 2021-07-21 09:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 12987c34a64b7f30de76bf693dde401c SHA-1: e7859e9fdac0565bcf4846102b5a69c0519afeef SHA-256: efe32503d18a9a88efcd8e4d46e847f42cd5010d7ffa36ca73c60f68e08c1b63
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure due to its structure, which consists primarily of an image designed to conceal clickable links. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used in such lures to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 82 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://aksaaydinlatma.com/img/editor/image/file/4939023375.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4509be5528---64585753300.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/0m6apg8rk00li4ndbl9vk5fcp2/xobozikavozitazupomeriwap.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b18245dc48---32554157645.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c93040b9d32---5196023785.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5835336b---bozugosobuwexesagigumidis.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e458c2ac1e---nuzap.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e6f1b919---bafigesarefivuxuv.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/supenikumetajiz.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/dumek.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016792d9b1---56741924650.pdfIn PDF document text
    • https://t2sc.me/userfiles/fonasef.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ougjt0h5c2sef25kau6uaqfc3/69826437551.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/77660570796.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/36311703399.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/morapa.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/13021732290.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7ceb1cb7cc6678e2acc99a92114d1357/41200567659.pdfIn PDF document text
    • http://come2menorca.com/images/file/rivazibixanaf.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/68680923667.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/99877216199.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/mubigexe.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b89331736fa7db92df99081f107df25b/9839642009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=social+deviance+examplesPDF 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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 10720 bytes
SHA-256: d6719d809390165a88e32c19e8f26cb0144397f41cd6c611e54863ea284e7e9e
font_02_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 16836 bytes
SHA-256: e55c2991b0a9a57f23cd62da800ddc7306370510c3d9c5d46dee7aa2c6707e0a