Malicious PDF — malware analysis report

Static analysis result for SHA-256 91793990fe64fe8d…

MALICIOUS

PDF

111.0 KB Created: 2021-07-04 21:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 65681c12581b605d420ac30423c2036b SHA-1: 13f203ab8eec2ee9f9703f7aa53d4bb6ae588749 SHA-256: 91793990fe64fe8d2d9e5dac7f5dcf9857e6afc227717a23642a001b7e6b69ae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites hosting further malicious PDFs. The embedded URLs and link farm structure suggest an attempt to distribute malware or phishing content, potentially disguised as legal documents like a power of attorney.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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) or Microsoft license-boilerplate 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b058cab4793---17262982216.pdf In PDF document text
    • http://qtjdb.com/UploadFile/2021/06/09/file/20210609_104122_135.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083f37ac5c2b---denaporaganod.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/poxukegitajukisagimamome.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9276790281---kikonidagozodizelisefu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/2661186630.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///2330183059.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/95170046325.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/46618871266.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/66054013169.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/cc9a22fc731acb38950d7e295432c1c5/30271365583.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aefae347bc7---komopexapigujinefuma.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/betivuduzumagumunaweviju.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/91577971225.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5ee8af28597975153d8138e7f26942a5/xokewonivot.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/80715188949.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a107ad4bc---vuzuvigokesemadik.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e4967bafe5d2dc1c6e24bd9b890932ae/bipeteliguwamodo.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/rexedoforiweze.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aa59079ce---87514360175.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f702405728---25432857844.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/df7f7321ef2c8aab86597f62fcb1ac10/mapijeragokosuterino.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c7a99941---fedikobupobuwogijevip.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/sakanepisu.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/333695541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=power+of+attorney+and+guardianshipPDF 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_off00014cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEF 11032 bytes
SHA-256: c4581b085e9c5ab0ade911773beca69306581b615d1b966180de16afa62e207a
font_01_sfnt_off00016672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16672 17812 bytes
SHA-256: acab2e77d7a34c0ceb601aecc171227740f70cb679c3953025646eaa836dfb53
font_02_sfnt_off00019516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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