Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3678fc946dec646…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 03:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff1f1a483b6dd37464b524ec832df99d SHA-1: 93541d665fac46b5152fe6596ef17cb67a6a8b26 SHA-256: f3678fc946dec646d2068db87223b5d98e3ec3d69958a8f324c90897ee5d7974
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e8eabb0c5---tefunezukar.pdf In PDF document text
    • http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/59698654803.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f1738438e09---lefuzowuw.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/81451362507.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/18479838354.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429195051188807.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/be40db591a1aa4916b6d9e6601fb2b11/pifugotimekop.pdfIn PDF document text
    • https://diphong.com/uploads/71741098462.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0a0bc9ea99c1c80121dcf3c521545c02/zipopepomikojurixovov.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/fafaratuwulexaw.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8c942ef1489deba0c2c3fb0e62ab7d0c/tizamebedejapizipemik.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086123a3f7ec---63155109572.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/2f11222adb1e6306df4a77b75f65aa23/27233923226.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/94922664585.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3cdf2f72ec2ca0866b77695ac83a8b98/21388989246.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/kukuwozubejujepuzeveri.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0d29db297---famemusukabasafudofumexus.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/xezefetikidaka.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/5607014508.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd20cbfe66---jesajegulodaraguleja.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612140df8d183---11394573891.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/pajusop.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210806215846.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/kirizixijeko.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/ratasuzatejowawukuwapol.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/ruxasosisaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dr+driving+2+installPDF link annotation
    • 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_off0000c6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BF 10360 bytes
SHA-256: 334b7654c4e303a1cae1c290050b77d8050660e02081be48c2249459b8effc31
font_01_sfnt_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 20196 bytes
SHA-256: 5268a9f832310152162ffc0283ea0466ea1f3df159e23c5ba0e47b24e6b0b2c3
font_02_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1