Malicious PDF — malware analysis report

Static analysis result for SHA-256 0694debbd0cac5db…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 07:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e97872c1ecec2f030fe04c0c4fd1b88f SHA-1: 9c9692c1cd493741219e5064acbb0162f98dd08a SHA-256: 0694debbd0cac5db636dcbe241a7d925ed5ee3ab0c315d372eafbced00efb9d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ce36b9c4e1e9a730a3c1c0c451236ea0/gamepawasupotaj.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d763eb658a---59137970382.pdf
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/26022034492.pdf
    • https://twinslock.com/locktactyuma/userfiles/file/bugubo.pdf
    • http://aid-calais.com/userfiles/file/29932360348.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zogebog.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0eeb6c9b1---52092986380.pdf
    • http://pileshoppen.dk/userfiles/file/buxawemekaralojabo.pdf
    • http://forter.vn/hinhanh/file/85065185328.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/68003889677.pdf
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/12955187377.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b616700d7---81179885178.pdf
    • http://easyliveconstruction.com/ci/userfiles/files/jaxoxuvoruxufewaxibi.pdf
    • http://massimosusto.eu/userfiles/files/97127687753.pdf
    • http://sl-light.ru/design/img/upload/file/13396044627.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00e85dafa3---kuzifamuxadeleritad.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa67cab883---39738080530.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/703646a1683e3d10a843fd9ec5418db0/mivagitobazujovanigex.pdf
    • https://weyergans-hcc.lv/userfiles/file/pidaxazewivewinun.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607990ca7be0d---tadixifuj.pdf
    • https://fullprotec.com/ckfinder/userfiles/files/buwolawusabarafofi.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af60450b468---tevejaworekida.pdf
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/powigefaxevijexulakip.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/jd6ugv024ojoed1fslqultfb66/kapulurobinimezilizumu.pdf
    • https://advantagelic.com/singhania/downloads/file/darilarazazofab.pdf
    • http://zhengfutz.com/v15/Upload/file/20215146953057.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hdl+cholesterol+too+high
    • 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_off0000df84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 16792 bytes
font_01_sfnt_off0000f796.bin
33b5cd225aeb7aaba356e56c136ca2d90fd55b4b159ce64865251ead9b8e48bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 17196 bytes
font_02_sfnt_off0001243f.bin
d4659042feeeba43675ca6492965c1f1de38568823a267f3082fac7c9d3fbe52
pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 10376 bytes