Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44aeea2ccec3675…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 09:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93f05d0352485a434e5451b740015454 SHA-1: d7abc4cfad8b77c8d22ca7738f2becd170d6353c SHA-256: f44aeea2ccec3675407f7cd76316e81a3e9af08a80257dbbe9c8ee7c24421376
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://area100impianti.it/userfiles/files/figewivebenomirow.pdf In PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/57321608949.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/12175987884.pdfIn PDF document text
    • http://espokebar.com/uploads/files/51062481587.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/18559505821.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/12282347189.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///wiwegidikositozegab.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/99798427552.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118689ed1966---tariziwigenal.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/67m36cf32pcn9eisurmge4stm1/vawepavijav.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/parilinefove.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/zofupuja.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e782c5b479---komonorivu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160904040450bb---70847310700.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/61483269908.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8be38c4085f8e32559d52c89e4a22ddf/wuzawid.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/17974531233.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/49fb9438946dd4156ea42a27a2dadafe/95455314738.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/87ed2525d3382320d28e5a24d2f2162e/xadexelewiwepemixitekow.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/59765715769.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210831060824.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/tkm1nolfu1940tv421h3gbllq5/39123781513.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/32496933492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=a+primer+of+ecclesiastical+latin+answer+key+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 18096 bytes
SHA-256: 23549ae9bf6a0c4e38945eb88bd3f695bd996ba690a01a2f156cac576c0a1e03
font_02_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 11056 bytes
SHA-256: 5e20301cbdb7aaed7caeeac803338cd5a8fbafed1a6fc158cdeef116f7e2e481

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