Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d2f68937745df4…

MALICIOUS

PDF

106.7 KB Created: 2021-08-09 12:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8ab370ae5cd8bd8809b4ec8b9a5dd10 SHA-1: 2a5285dfcba3b4c281f90eda9f89c436e2d6e320 SHA-256: e7d2f68937745df43b42383fa4116e1bf79b6b76dd0e84e75a549b518208717b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://philabc.ru/uplcv?utm_term=nctech+iris+360+manual
    • http://onlineexpert.in/userfiles/file/pudabawogimimepusunuxip.pdf
    • https://braintreeclinics.com/app/webroot/img/files/44237046037.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c7de6836a---teguxi.pdf
    • http://bjallstar.com/upload/file/77280918354.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c520cb95dd2---suvut.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5ba6c7v90dgge22ib8gfvbd0b7/ridezixekare.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b18432651---momirevaxokosujezibob.pdf
    • http://maasmartcity.com/userfiles/file/14746480398.pdf
    • https://aprilboya.com/userfiles/file/tewadavoparepoburobimo.pdf
    • http://chiengthai.com/file_media/file_image/file/boxadasanu.pdf
    • http://polyacer-ecp.com/userfiles/files/20210701_134703.pdf
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/zokigati.pdf
    • http://marinapogon.pl/upload/file/53964117219.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/83700639f7d1a252ecde1314ac4bed54/besujekeviloxig.pdf
    • http://batiment-tunisie.com/userfiles/file/xapeduzow.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/44d35d64fcc80d86b6629c83d38ee0fb/98605651268.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a5d979a45eb510aaec0c1b87070a2c76/widupixedoridatimoruwiket.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2cc56e31bd20d7f0e1439b0a56aabe56/26207184987.pdf
    • https://nilsahost.com/calisma2/files/uploads/wusupezaposikajatumibuna.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/bda6955ada9d44d0a91053cd88f073fa/wavaba.pdf
    • https://smartcrm.cloud/upload/files/sezel.pdf
    • https://alianzatours.com/imagenes/file/fogowu.pdf
    • 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_off00013e8d.bin
4358f89980979967e9b1465161fcfe64b9bcadeaf501ce731e855690112114e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8D 10916 bytes
font_01_sfnt_off000157b6.bin
29c0fa073d41746d4aa0dc0daf9d71bdbc85cfc69f497b507545f1debff2b92c
pdf-font-stream PDF embedded font (sfnt) at offset 0x157B6 17348 bytes
font_02_sfnt_off00018555.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18555 16792 bytes