Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c6a2833e75a020…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 08:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38d4019e75b9e4b9c59d8520a03a949b SHA-1: 3cb1c790ebc0e9e70533d1eaf3cf197d77fcf017 SHA-256: 77c6a2833e75a020923ce9e94b4ca1252d4f9d2a5558dea0fbf3b33ea654a7b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://philabc.ru/uplcv?utm_term=neurobiology+of+empathy PDF link annotation
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/vefawirixuridoluzomiwun.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/folodumarofakozibetenawe.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/76779070775.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a8de4f91418dbb4015944f5554e78882/folinigose.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/02/mewetilusevugozebegope.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4c88ac396a45a9b6d4f26b48c8ad8e86/75896328018.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a3ebc5e417da056269389d81cc3ed7e/83651621909.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/363a5d7708418889a5a0f1306f4ed195/21591893958.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/satadeditutobatelenivupod.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/25571344252.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/71433190352.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074015a99b4c---79713906593.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608743a23a234---depugow.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/j7r80luvid0t564nntn3nj9ld5/81131634810.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/8504728253.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/nawazunakowaresupa.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/19496387478.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ab41bebde28f6c680e135a37b589d62b/wunelulilibiwemav.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/marudubemugaxiviwopemar.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118f1f54aa71---todipazalu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/62061744702.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/makuwifusuzufenina.pdfIn PDF document text
    • https://sitarasign.ir/data/file/zutuladuxozutewuvavuxu.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_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 19004 bytes
SHA-256: 7ce5070a6a65055dce830b1c76a5b4153491b14e54244994dfec4abb5d6bc137
font_01_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 10864 bytes
SHA-256: e0d897dbf22834d8262124027731dd1c0067ea2e843f58f79b4230c0b0cb3032
font_02_sfnt_off000136af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.