Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8918d598188c7b…

MALICIOUS

PDF

124.1 KB Created: 2021-09-03 00:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92205368d8a5c224173de37fb69345fb SHA-1: 673bd7b8165aad0329635bbd12c9e3d3a667cbc7 SHA-256: 1b8918d598188c7bb516cb1de0b37ab58ce4f9af647b64484c25e1d9cd4388d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests a primary function of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://synerhu.ru/uplcv?utm_term=sony+klv+32bx320+service+manual PDF link annotation
    • https://nnt52.ru/userfiles/file/68670322536.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/55408053091.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210718051650.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/febogesetop.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/68383971050.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/u1jeccd2kvrqefh75r99peboq6/robaziroxoxexipepizubuj.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/pufebupotunavefabotej.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/tubogavalixagaxibagexe.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/zukararipatesusujusupa.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ed124509fbc---43851639750.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/ridemisif.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c25b77636---13542350628.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4f407bee85506f94d348d95a3883fdf1/moxibezapagolepiwawuved.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ca8a9e50de98b2e99742241bb04a9b2/46876865468.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6c06c639c2328137d743be1ded4ffb34/47775483073.pdfIn PDF document text
    • http://freeorden.com/media/file/57768102725.pdfIn PDF document text
    • http://toonesk.com/upload/17670159059.pdfIn PDF document text
    • http://computerdoki.hu/user/file/13659707798.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/qde4ul1t89jtrjm0b7flcsq2s1/dakubal.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202108292317033249.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba334095ffe---15698844760.pdfIn PDF document text
    • http://buckleyfamilyofdarling.net/clients/0/01/017bf228c8331327bdfb67b1798bff80/File/20873883115.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/555b65079586162db9533c06222ed3cc/napiburigeradige.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_off00017a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A00 11396 bytes
SHA-256: 89c1518adf31b2cbd929efbe6be54e392915cba7dbc8693cd34fbf036643b44b
font_01_sfnt_off000194f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ad05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD05 20164 bytes
SHA-256: a62a8e24cae5ecc0b5f75c23d3534c06f0577f5d972a133a3de65ac7111cf983

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