Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a85ac2985d7269…

MALICIOUS

PDF

85.1 KB Created: 2021-07-05 04:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80bb462f40cefb2447a322c7b72e0ba5 SHA-1: 0079745a61e1b4c9d39ca6f918f5aa2cb578a89c SHA-256: 76a85ac2985d72697dfe0acd7425c4912c3c43d705c2a44ac17180f9067f589f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=muscle+that+controls+breathing PDF link annotation
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074a9eb295eb---67642099955.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8351632b---safiva.pdfIn PDF document text
    • https://hssanesteban.cl/files/gejomejuni.pdfIn PDF document text
    • https://parkettworld.com/upload/files/loxubok.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/daledepobi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4533c1ae9a---tabaz.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/82282980028.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fd1be81f9518a63f3f6272c1fc5bf887/38596566693.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff8fbfa8a---gukaki.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084d42f9dcce---kepox.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886e4200f3d---90001037348.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/fhc103a0ol5dl8utboaaerv1ug/luxoletes.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/gabuwujimokanobupi.pdfIn PDF document text
    • https://eternalbliss.net/file/65576140660.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/ladimurewosoladoxi.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/molukofe.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160810aa2c2320---82234857238.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/pegaxuzudozisexiveligaw.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/rolewusamikazibodikuwiv.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/35598405926.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f9fd0fadd9d36085a23e3cee4cbf65ca/godadiralisewixisuran.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/95266264346.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/86712749696.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 17028 bytes
SHA-256: 264eb5a6cb709aa1b9eb88406d47b0aeee5f4c8ee292c977cd01a7021328977a
font_01_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 10740 bytes
SHA-256: f591214b93d7c4e0c3ecee241b4386f8b7cc40f56c6222f73a44abb57a8a82fd

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