Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed67c1244e4b018…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 01:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b11a8fd6b1faedad11dc46e6a7574b2a SHA-1: 310c621eb4077c5e63dd2e24d27c67d386c11c2e SHA-256: aed67c1244e4b018cd80fd9c1c4facc8afbf83ee6170d3b35259a149c00e1708
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm. No scripts were extracted, but the structure and embedded URLs suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/ad775a922da752d8ee20d0844adde38b/zojokakuwamofelunaju.pdf In PDF document text
    • https://organicfertilizerproduction.com/d/files/91337992410.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/davoledegapavuwi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c556188b1a2---simevefukitip.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3c7133e0---33395777056.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mdv23t77rmsahihqpv7ek66npm/jorojibebameloke.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8ca0df47240f115c443ca1f441ebbdf0/semoxudibik.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/650360092.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/wemapetuzomejux.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210807_7C4B83095DCB2FF6.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/90637805691.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/somumosafepile.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/tufakoma.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k1tsuv8qhdjbgkurpg0cdqk6s6/tepawumisop.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/27713744748.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160973ab1cc07a---zezovukupufumabavebiwugi.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/15861386603.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609295d7819af---86145137465.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///4060535395.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/97272161203.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/50879788215.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/zoxizuxewuwobodasuvune.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/66828768949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manual+testing+3+years+experience+sample+resumesPDF 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_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 11076 bytes
SHA-256: 1033ccb0ec55f4cbb6766f70565c6bc2e4c663d1069d1c958ee707553d559587
font_02_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 18184 bytes
SHA-256: 5bde6d969d66f61e734d8940f56a8e405f50256ca7ac013f464ac449aaba6f50