Malicious PDF — malware analysis report

Static analysis result for SHA-256 932e7ca5f7a7fe16…

MALICIOUS

PDF

90.7 KB Created: 2021-08-01 10:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b955035bac26996da662eae07ab1d749 SHA-1: 8993a802dce5f2904fc72f2d542100e922869f4a SHA-256: 932e7ca5f7a7fe1617b16d280b2bd0527366d0cd9b979cc121da82e6d583af7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://cructi.ru/uplcv?utm_term=are+honey+buns+vegan PDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd92ac54e92---wofojurobuwisinolekebi.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d2dcdf44af714cf599328181352cc6a8/78706876067.pdfIn PDF document text
    • http://dogable.de/userfiles/file/64444198000.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/96008208577.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/71066710924.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c7ac16ace---96987277818.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2e49e644ede2d60a64f9e63f0fc14c5f/kajezemin.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fodukusoraxinijepasegusim.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/pufavogebifujepebipizoga.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/15943324465.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/gosib.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a0b51c6a996876bf9982ac3e759930dc/vamugowuxorozekose.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e9a36b4792f203b1c6b7fb2d54ceba33/87556887656.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1305963ff21bc8f240e7f8870db58c0c/63163252031.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/nutolumimivuravakebonifav.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/58516620280.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/laputuniw.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/97258174540.pdfIn PDF document text
    • https://khanikango.in/file/42580509472.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a29077d344a---lowevixo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6509aaf716a1d8eccb17c712310e1557/26947404483.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f23c057b51---90181172865.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c9596f56---56051266244.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/29238402477.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/bazug.pdfIn PDF document text
    • http://amandamaitland.com/images/file/98354980130.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_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 10552 bytes
SHA-256: 6987a53aaad6aa4822212a61af80969c69f2569f850703fd9106078f69156225
font_02_sfnt_off00012dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD5 18332 bytes
SHA-256: 74232be3641f4be27b3f1fb0cfaf9d3440744e206e0a3640c3847c51db683c6a

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