Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b1b7aa5ac7f566…

MALICIOUS

PDF

88.1 KB Created: 2021-07-24 12:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ac0afa9fd2fde18af2a47e0b1b5e636 SHA-1: 57d06a1a9176cedcdacaa7fd4cc83541a82b36f6 SHA-256: 33b1b7aa5ac7f5664031f20aa8626d88c79bf5a12c752e36e27d2b72634774e1
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed for SEO manipulation or to host malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://poolpoint.be/uploads/file/15881288295.pdf In PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b21cf11e653e2997fca1c4cb46b8fd58/sogov.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/54908161112.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f970eed1ebf---34584283742.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/5462074646.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/66205303397.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f64c778ac5a---67942724600.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/ponigefikamizurog.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739fc8b39be---68316821781.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/3383280472.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/38431793453.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cd4ff28bc---punumaletun.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/wasuwofomezusavilotarep.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cc18c96dbae45d9af0d275dae7e03709/26606249581.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dde51e7a2ac---pasavovizinaduz.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/24scacmertgkpq87m2dp5s1k3a/sotatofaforidaxodufuluz.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0ef3d468---rozowotig.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/namodelitanojegusakezavem.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c623c79643---pusapagi.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/fixejimekageno.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/wevawarip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+way+to+clean+instant+vortex+air+fryerPDF 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_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 10752 bytes
SHA-256: e99163bd78091bb7c9bf0468affaa544696eaeb484c06d585f14f09318d3edfe
font_02_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 17556 bytes
SHA-256: 56cb6d3d2eb6efbf373e490480cae53c2da9f8dcfc0cd6d85f4084ef5ead3c96

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