Malicious PDF — malware analysis report

Static analysis result for SHA-256 1981361acb74c9e0…

MALICIOUS

PDF

99.8 KB Created: 2021-08-19 06:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c971931536ea73eeaeb7424b09c125f SHA-1: 5e86e544c6729656b7607fe466a6ca960f29f2b7 SHA-256: 1981361acb74c9e07524deba05193bb62d5d1d73bc5ec1d14d01ae89b857daf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=what+should+endomorphs+eat+to+lose+weight PDF link annotation
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/bbbe4ef5e9d9d48d88fde6dccfdf2b2e/66144173272.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/45871524750.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b514af97e648a0841e1be695606728d5/vulupomuzunojeg.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sileza.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/fkbt3deuc9ls4pf7d7aet03aa3/42948442502.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/49546280182.pdfIn PDF document text
    • http://netflor.pl/upload/File/gawemodovad.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b26165f73---jekusis.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/finizobedovesuguvek.pdfIn PDF document text
    • http://greenbrier101.com/userimages/sifenolizurixut.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/51972506534.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/36920887466.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5aef61fc2cb71168d745e7b3ebf4bbef/nibovi.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/25268691572.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/92604095879.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/kijitosotol.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/48701349307.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/3373097555.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/zenibadupopisosova.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/40410809620.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/tapulavafanosawumibanafu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607442d33bf03---31641428161.pdfIn PDF document text
    • http://forum-auto.ru/data/files/24524436271.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001378e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 11016 bytes
SHA-256: 1d045b97f6d5bcd97d4edaeeea328f66be583ce7504ec1092eb942c8391a7134
font_02_sfnt_off000150c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C7 19732 bytes
SHA-256: b17d1803bfbc0242516e66b7018e00883f6f860bb72fa01394c1f3ded426920a

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