Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45fa3d957551dd0…

MALICIOUS

PDF

78.7 KB Created: 2021-07-14 03:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d6a21af23b4675e90b0988d921ab83a SHA-1: f52d443ab8437162e2ed5739831706a94aab7c56 SHA-256: a45fa3d957551dd07ee445f0f19efcce023dcc727daeef3fb3422df53e75c614
156 Risk Score

Malware Insights

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

The PDF contains a link farm with 33 external URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV heuristic strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links to PDF files on various domains suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lumieretvie.com/userfiles/file/55215718446.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/lanavutawimokolo.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210609_A974EF99AB29A42E.pdf
    • http://caudafotografia.com/userfiles/files/13705414959.pdf
    • http://teranor.com/ckfinder/userfiles/files/vizitunevevez.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/bm6cak3rjvpd45i6a83p4m5u1f/najevowa.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b20f105c720---84980187715.pdf
    • https://dacinsara.ro/fckfiles/file/kubita.pdf
    • http://etasystem.net/userfiles/files/lirozawidulose.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6f9ade159bac549e7c3799059c3e89a5/29286781028.pdf
    • http://robwalker.net/fckupload/file/lopefejokuzolu.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3da51a65---buxamukajimubaberulotem.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/mtluratn8k408ot4bug2qmsdlm/33253604383.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27d6fbb02c---toxubezikowuponuvanatepu.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecec8d5e242---gafesojekifo.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/35j5o5hmg3dn6t955hf3bonkb6/kudelibeverabenodixibir.pdf
    • https://shipnhanh247.vn/asset/files/zirobezewesevi.pdf
    • http://staceyasp.com/UserFiles/file/vijotuwosufikakujafugud.pdf
    • http://kuppersbusch.hu/userfiles/files/69722560968.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607349fb36aab---binufumusifovizovawenevut.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ioa3of4s2qjlk8rrhk8h54jn12/tusozepelorukofavubogi.pdf
    • http://rencontres-icare.org/userfiles/file/35262254581.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4894fc432e---zejigejijolug.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f178e1bf2---33968700658.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jesus+is+the+answer+for+the+world+today+lyrics
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb7.bin
2483b86d790545fe10e2d26a440d3ed71c9144928c80f06c1662508fac5b0181
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB7 16736 bytes
font_01_sfnt_off0000fa4f.bin
71cc9f02f19061ba1c6df46637e575974ead7c2df97c82f533941990249e0f8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10864 bytes
font_02_sfnt_off0001137a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 16792 bytes