Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e91c5b023f9a04e…

MALICIOUS

PDF

92.1 KB Created: 2021-08-02 02:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 220663b8973ce8c40281fb23d12b4c34 SHA-1: 8d4d703ca6a266213088e1e106982733fcca708b SHA-256: 5e91c5b023f9a04e3c1fbabc113f4817c02dab61081ddd4b6268c22198d97405
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://heydarbaba.org/resimler/files/wuwesoxivob.pdf In PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/174143da9e21b741440e938fc165151a/xejudodaraji.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f47d63704b---45922562385.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d57200543---37963901194.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/rorodomemowagotelaxedawi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4f5c4fd2---54175731880.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9d4db03d---xawiz.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca4624989---78722066424.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/63713402929.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/sorojitamixexevopenaw.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210611_81B51F9E24C1684E.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/89779195651.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/bevimemeferozonobofavafor.pdfIn PDF document text
    • http://multiairservices.com/multi_air/upload/userfile/files/75435743309.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102bfbcd0c62---ratabisixusojozunow.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/57994317318.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/pigiwegotemotorimovibu.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/93805720415.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/aov3o7e9mhpm228u6ernptgv45/jopajogudewipapat.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/kiwuk.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/67172786291.pdfIn PDF document text
    • https://dhesient.com/media/18888561727.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/lukaxofaleviwefodasov.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tpd5j5cdf31n6tol008152hju7/91679152514.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/48197618642.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/87663867310.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/kikigawunoroju.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/wusuzakiberage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+apply+for+commercial+drivers+licensePDF 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_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 17412 bytes
SHA-256: 5efd41f9b933476813a47dceadcfa5b495e029e38dfe416ff2d8a02d8fd1b401
font_01_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14838 11040 bytes
SHA-256: 83c78800bf270cf58fcf9643ed357c965474d2d41b292c37b8070f17f24a1d43

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