Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0479dd12b56ccd9…

MALICIOUS

PDF

98.2 KB Created: 2021-06-28 00:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: aaf3918c9c591c0cd9b334ace2349d14 SHA-1: 9776a212789d7f188566e18c800d8e922f9a149e SHA-256: c0479dd12b56ccd9cdb5e46875bba5d0cf70be46d7ef6c90145f16b1e79b183a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the embedded URLs and link farm structure are sufficient indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://smidgel.ru/uplcv?utm_term=specification+meaning+in+marathi PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/o8mdanmfmussc07jst8tsfrv77/62481882721.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c782033a6---69064830007.pdfIn PDF document text
    • http://aimic.com/userfiles/file/kukuwezelinerilisi.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/54ea38df636a91a90da97a828dae646a/jebovepofa.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e43a4caedd1a9b84eb361c4f03196967/98346662170.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/wisijadilewedexuvowuragi.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/8c8cfe853e44fbed5b7f001a8ad176d6/jebobikif.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/32c41c43c7c86b9b331e006612b99538/12410038371.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/nibokud.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742c060b0c8---genebapemakawejeraxesu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160700d95de59b---salewemi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/cq87s7gltd85bsvbb6vh1q8hn1/fupitinok.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/68872833390.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e968bbd67a---41237510073.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16082738b2970c---vujeliseja.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f37bad011b501f0bc2f466736ffc7373/49751108088.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ds6p53brlv9i10kv2h12d63jt4/lolilupedosa.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/46425613224c3765a6300b31926ce758/gaterudatokawerakavex.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/penijudatexikab.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/mazenegokojuruf.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cb67bef49ccf307f1045d0c0362952fd/48136221882.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/dakewiwamikopezapij.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766cee7cdac---fisabamet.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084a72845f88---vapapavifove.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001108c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 18212 bytes
SHA-256: 091b7f81895965f4460df0852c98ced4ccf1e658c19620c2eeeffe5f47d9bac6
font_02_sfnt_off000158ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AE 2156 bytes
SHA-256: b6bdb761ac256384ae39193916f73726462b4bf4fadebc21a1e99cae0c55fd3c
font_03_sfnt_off00016253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16253 10788 bytes
SHA-256: 54de378c8625bf3e5120629bf5e552a12b3cf9609e5d6760bb5cb54088c1e1f2

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