Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3b5f6f6ad7eff9…

MALICIOUS

PDF

90.2 KB Created: 2021-08-02 11:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4f480a0163ef1a141f3d1eab113fbd1 SHA-1: 2b02171ec6b059d6570ca0d3ce111e0d3c27ca18 SHA-256: 7e3b5f6f6ad7eff9a12619eb3ed4af2effff8820043c8c637deddf781813af2e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://renebeumer.nl/userfiles/file/97461007582.pdf In PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/44184631480.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/13851568361.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/djvat0ll55sq6aigd61hnsj5pe/toligolavuza.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/zotulifekogajuditusivosaz.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/wakajifedobapa.pdfIn PDF document text
    • http://chinahongji.com/d/files/leditatadoginekedawume.pdfIn PDF document text
    • http://stylekd.ru/files/6898098445.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c29d08bb9a50282374efa226e0a7a597/duretikumosonusubekome.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/90707357855.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7e5f3354d4f15400a25feeb9239b5f9b/96943794909.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160838ce4e7b01---54918424902.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/16819939531.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/75711468993.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8c2a4d62717436e412d578dd6aec4e1b/lubomopen.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/lsmn5utea8u98jbdk77c71023l/37666993330.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4a360a7bfd0a43e096c8c249bd984dcb/4484947157.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5b33cd0e0c15d870c2459977a6f1f021/jabegobiwilubi.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/20fb3086bdf8eb167dfaff41df82665f/15263170439.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/sguhe4kujdj47vdtmapp4r8qpn/53939311812.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/nutijunonide.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/vovoturuwijiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=extra+en+espanol+episode+2+worksheet+answersPDF 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_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 18448 bytes
SHA-256: 6ff0d534e6c212e5ee47068c564f5e73291bb3d8136d2b095cf2d14651043bee
font_01_sfnt_off00012896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AD 10872 bytes
SHA-256: 9e6235646f746f0de8545ea9a1754de465984b572f9a41ad6a02d72efa9e9960

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