Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3fb54fdfb34ef6…

MALICIOUS

PDF

128.7 KB Created: 2021-08-17 08:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1ae7233d3e64508afd1551ff1a7fa111 SHA-1: 8a104a5aa6f5d0e6e22c47d32106e7504985d841 SHA-256: ff3fb54fdfb34ef601b2b08c95000fca1a9c5a0277e6f6ee5830d7d9745bee85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable domains. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=motu+patlu+cartoon+in+hindi+all+episode PDF link annotation
    • http://zamel2.pl/userfiles/file/vugepobixuliduvaxex.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/tukelavibujimep.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/dutefare.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/af44ece81f00c30b2c15f21efaa061b1/duvafejanapeguzu.pdfIn PDF document text
    • http://djpress.pl/Image/files/71431630931.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099faddcdf30---vimaxowelubosanen.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff098b2ee3---97071646892.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/rofedalunemeseribosodosu.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/lerusubirapefobejo.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/satabime.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/76250860558.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0096147c---51979064510.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/bikagoduwabebopuweruzatu.pdfIn PDF document text
    • http://groupkaishan.com/d/files/litoraluwukitej.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3593c28c52a9f322cc85cd7e22bf6752/95849541692.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/mexijofaki.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/89933853226.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/37062540480.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077b95a31d72---pexiriwi.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xinipixe.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/pudokakor.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/84441462425.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/99120586863.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/jexumujozajuvunejeketop.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/50208819287.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/pefedofeloximesew.pdfIn PDF document text
    • http://intergeored.com/upload/File/24556742275.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_off000193dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193DC 17952 bytes
SHA-256: 20e858c4a12cd35bea490dbfec2341c7eb054608079dbbb32e8ad4f16fdbf01d
font_01_sfnt_off0001c305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB1C 10704 bytes
SHA-256: b78bd1c7e447c2b3a31b74114591ec8eebc90f9fcceb736475ca95619305d4ff

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