Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44807ef9fb31b79…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 19:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27e0f914627ab35ff6699c768ad28c8b SHA-1: 2557afec1feb6390b8d519953b5d94e6d5ad66ce SHA-256: a44807ef9fb31b79b2d03efb651b4344656ca843475ef045e4d7f40d283d9f3a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c3788a53---92422521605.pdf In PDF document text
    • http://atmaircenter.com/lb/userfiles/files/75254213567.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kivevugole.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/55676604837.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b5a882dac---nixezopur.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ns4h3n59pk0suj53i9bgmbgmg2/9532145497.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f266cd3e---kabuxelura.pdfIn PDF document text
    • https://quizai.com/uploads/files/noxafudeleboduzubakuba.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/noxova.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/13a77880cffb9709e0b66151014c23ea/fajafozagunigetota.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/26047266138fea8db34978dde5e21d1a/difuvizepulota.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9f7bchmphp5o15e8chgod4o7j5/94690360165.pdfIn PDF document text
    • https://paperland.bg/uploads/file/75634740048.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/nufeves.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/vumavobesafabogikuwofiz.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5d2ac15c---zatamovukonuvilemu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608512a1f2faa---fopazikokibubij.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/wifemavejo.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/vojupalesodimezu.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021081512470794.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-13/20210713074455140197.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/vosikexupukixigaxalukofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=altronix+timer+6060+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/99697950471.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE6 10700 bytes
SHA-256: 5f55c9eea1785708107561afb923bb2d2d42d78484f1b781d9f82a7552d3016b
font_01_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 17028 bytes
SHA-256: bee964e7bd4a411619fae3a16d8de2adccadaf01d57bc079b92ea43bf3900ce0
font_02_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1