Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac92e4963a6b994…

MALICIOUS

PDF

90.8 KB Created: 2021-08-07 11:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba6155fe6b0f171c71c044a5002e3547 SHA-1: 7a9f87fe28a6f4d7c00230f62c21fefd255d4d4c SHA-256: 6ac92e4963a6b99440adf7b0b442180aa5a0bc1b746d8e291524dbe0c1b796c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://slsnn.ru/content/file/54072417530.pdf In PDF document text
    • http://mindentudor.hu/userfiles/file/55995880457.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/lisoxarizuvalixadikefus.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/buwugawu.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/jusebepuminag.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beebbc5dacf---lekagezawagivifozaso.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/74449374308.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5350d51da8---xefokelovifig.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ac904776---sebinutatomasox.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616f36f1de---wulesewubejofuzelalep.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610057e351a8d---23895256769.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b6f610a9b076ef16589f686ea9ac0b4d/lofadumozebetizekox.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b503cbb0---nisetepo.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/vidivomameselofab.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/67473073529.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/40658489155.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/b3e4ea7336275bc30744c4438a45c6d5/vufebarubidog.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-13/20210713085037401520.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/64895997354.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8883da329---91591493241.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607436b6d96ed---naxaloraju.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/57081592911.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076f50733832---jujanoruvuxuxopitime.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/suxopexanemajanepowowon.pdfIn PDF document text
    • https://tmtteks.com/files/90905355318.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/xabogoset.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+theme+of+the+story+cupid+and+psychePDF 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_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 11044 bytes
SHA-256: 37474a6d7b07ca386a23adf3a9fcebee4cb6143fc4fe5d4d2f676e4d49ed5fbb
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 17740 bytes
SHA-256: 51658be8599eb21d8a6f83cfb63cbde217dd5035a0917b448288af4e99124074
font_02_sfnt_off000144b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1