Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58e1ea24bb64806…

MALICIOUS

PDF

95.5 KB Created: 2021-07-23 12:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c0f4b2c2b14ea6afc77ad2a19e30b80 SHA-1: 9da7189559f87734e906bd6d1e6db8285990ece1 SHA-256: c58e1ea24bb64806213dec4fa7e8d6063d3e4ee55df03f261f172c00b5e83a2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple links on potentially compromised CMS upload directories suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://www.yoko-ono.be/images/userfiles/file/83463143299.pdf In PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/pikogunerebajoludenemare.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/18a4984c2bb56bc179bd9e2dba78289c/makobobexogasu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c6c55e0dafa39d16658e179224f91597/tevilaxavo.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/5cenbetc6v3nobtnr90a7ispmt/vokakeveliliregiguxijavi.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///mumujutusav.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8b1599b52da5fdf80e3db006f331647e/rapuduvovezivulipiseziwi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8f415bc8---75270814393.pdfIn PDF document text
    • http://alvitraders.com/files/29030361070.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/84036391817.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/lilaxireji.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/71sjd50mi2hkvf7nraeblqq627/73920352537.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ffef927c0c66582aebaa98ec997063e4/76255697972.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/jepunuluwegibubem.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/78e4b882df3fef4b6801d48e47268d4d/17589349289.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/90735194676.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/198a1324f4a8ff7e782d566788046d0f/87546712770.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c03918704---makekufakav.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e1f6d917c4ee3b127fe76bf85271383e/jutuweluzipafewuse.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/werevujaritun.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802d844fac---92178534273.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/22872081782.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/79642586134.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb83b1bc3c---xezewivadosona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+rod+and+staff+of+a+shepherdPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 17548 bytes
SHA-256: daff7d4190b54d40eafe0b8de331e5c3bcb2623f922a3532d5e06f0486ea0c46
font_01_sfnt_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C3 18140 bytes
SHA-256: 4a140bc60e28a46887076c507fc3a1a40f9e1806f88055129907b77ffce54d84
font_03_sfnt_off00015812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15812 10420 bytes
SHA-256: 5269aa52cd340dc6e9a4b53693d5fefe210da199ac16a3472909a2f93996e05a

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