Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3a36e0c3201305…

MALICIOUS

PDF

97.0 KB Created: 2021-06-28 01:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15f5fef09e1dd262d090d77b5bd4e74a SHA-1: cf824d0833c56f109e3c2b3dd44ec604508d4ff7 SHA-256: 2a3a36e0c32013054064701c03809348b422d93bfbd3abc0eea3e1105dec48cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the redirection via embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://accuratesearch.com/userfiles/file/bevomekozex.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fc1tn2ehlqh8j0qbuf8tdlvuen/28939016534.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098235e42630---bofinap.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a6e3de2f693a7220c8f9b3d499e4b564/womepafesuli.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/8264bcab4b4c067802c424ad0ebf36b7/witubumufa.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bd206287c---jatutuvinopanu.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081143dc57fc---garokawudisagusipa.pdf
    • http://valeneighbors.com/userimages/wejobasitakorufevagujij.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c56cd74ab---baditagiposeguxaxur.pdf
    • http://agiusfuneraldirectors.com/files/file/zutiwiboviguretoju.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f38970fbc---pitevegufipatedojenelodat.pdf
    • http://svaz-podnikani.cz/files/file/60812281776.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/kozezo.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097bac8bece5---47925124518.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c59271ce022---fadomuvineditate.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/dc5a593789c1068294fb76a643451534/rorawuk.pdf
    • http://jucal.es/images/file/9623811942.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b846ca9cc3e---fuwafudujovozotodojoruto.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/xanudurijafem.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/afce2fcdb488c69dfea8e6872ed199a3/jiwipo.pdf
    • http://hainescentreasia.com/images/file/tibukuko.pdf
    • http://adveotec.com/img/file/85506002557.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=easy+broccoli+cheese+soup
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd43.bin
d01c913cff9bdfc600c5ad0545fbdca0e9da3921538fbacf215ee528fff52eb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 18056 bytes
font_01_sfnt_off00012c6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6D 16792 bytes
font_02_sfnt_off0001447e.bin
1b5eb09f99d50d893f43d21100b3fc289a7b959ff05bdafe4e7131e53a197c75
pdf-font-stream PDF embedded font (sfnt) at offset 0x1447E 17176 bytes
font_03_sfnt_off00015cbf.bin
597ee57b72a7e96f6dc09ca6a4310172e364fa1ab523ff1907b43561314752de
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBF 10608 bytes