Malicious PDF — malware analysis report

Static analysis result for SHA-256 b336d82f7bd7a8f3…

MALICIOUS

PDF

85.6 KB Created: 2021-07-07 02:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d377b8e675817e4c7c5f5cab36407f0 SHA-1: 9859967cb4d9a23acea37e7bd0e0f132ad8f6474 SHA-256: b336d82f7bd7a8f35d66bdc00a9956d87de7e105b8dfcde0184927a4ae34adc0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple unknown domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://maychamsocda.vn/images/userfiles/file/jipusulirirujobiritaruju.pdf In PDF document text
    • http://ampletrekking.com/userfiles/file/judegowof.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f7aaa43e9---65894492003.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/buzokubalik.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d4e5c865e36695c9fcdee6e57c0820c7/80910500825.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/doderawilelerajimenu.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/4412791362.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/dupuloponesiv.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/51869856075.pdfIn PDF document text
    • http://atek-ent.com/upload/file/fudugegopidapitokeger.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb74c906d4---zeromenoxowaxemakikawe.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/05e5830d2812f54423743ed78baa23c8/24016746543.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e95915bc3---renapuk.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/wudax.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a21b396504---ripukelebuxixipejobolu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2f68eecf---65453956543.pdfIn PDF document text
    • https://baongochoa.com/upload/file/vibagobakala.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c0411651c---vesurekutod.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/09/file/20210609_003514_188.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/gozarivaparix.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/suxarux.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b3b5438d270a0aa7c2db72d2ba8fc897/rolonasapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=erg+theory+full+formPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 10332 bytes
SHA-256: ee7a6c6f8491985f0b2d8be06eb5b24cb960fe4b526bf097ba0ce8ce3c4268ed
font_01_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
font_02_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 17764 bytes
SHA-256: d3cfbc4c66fa34a33de814e7444e26c496456960431a85ee89b41f30bd6dd70d

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