Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d188daba1ccbcb3…

MALICIOUS

PDF

102.0 KB Created: 2021-06-29 14:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d93917d74947916ea9b56201d27054c1 SHA-1: 7b4110d4da39b386df8b6df6ee7273e01dc6f4a3 SHA-256: 4d188daba1ccbcb34b111fc4f8a538fff9d59da5b8ed58ea9d9d2384f5f34202
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common techniques for delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fc4e73f9c---jodapovun.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/53388a25d110d3d18172b06906533c60/79795028967.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/8dpfo248akfn5kqoc757omcub2/dadilutogo.pdf
    • https://gonguyenkhoi.vn/upload/files/mipek.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885171c71f3---sonotigofuf.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097ad5478e71---98487082793.pdf
    • http://polloricowings.com/uploads/files/10622344920.pdf
    • http://cn-polylysine.com/d/files/85791796882.pdf
    • http://re-view.online/fckFiles/file/15917259159.pdf
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/puwubapozivuxagepedejewa.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7v98anv3f334fch7mr9m1jov77/xafinimunodiv.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/kajupo.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/j91qbd3c3nv9bb6ip2kak1btn1/xiberomubaditekipawulebo.pdf
    • https://khanikango.in/file/zawogatigijokubole.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/31278f422861bf11efa321e7bdbb6d9c/duwokokuvupilijela.pdf
    • http://arunimaflavours.com/userfiles/file/31295899667.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/26b8f4ea3f66cb522feac7c4c6940e88/titajavubiba.pdf
    • http://fzsvybbs.at/userfiles/file/72842362777.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/fa57412e1892643a39effbc9d8237d7d/sekiw.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/aa7298fcfe62bb620f3430859fdc8070/roponuxokozobefam.pdf
    • http://elite-nails.pl/Upload/file/bekabopebew.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ovvm86knetjnt6p978qmais342/wojikokisabiza.pdf
    • http://shelton1961.com/clients/35589/File/zatidubinaxazapeduropu.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c245856aa8---66875025222.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=boxer+cross+puppies+for+sale
    • 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_off000129a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 16792 bytes
font_01_sfnt_off000141be.bin
5c5e3a783f4b0940036b67def07355c1e98ec457aea4d99b5c956cfa762704fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x141BE 10524 bytes
font_02_sfnt_off000159df.bin
55c4d00947521c1d6c35805051ced9e8d0f3668123b0c16931cd27f0058ce364
pdf-font-stream PDF embedded font (sfnt) at offset 0x159DF 18708 bytes