Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a38bbe56d652f9…

MALICIOUS

PDF

86.8 KB Created: 2021-07-16 07:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17764a3592a47124ba97309a7294cae7 SHA-1: 67d4d4ad838f42ae5ab53498e9cd8bb2131a6995 SHA-256: b1a38bbe56d652f962e749abac48b99c1c312fe0909b47453f517a8d4efbd15b
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting domains. These URLs are likely intended to lure users into clicking them, potentially leading to further malicious content or phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=how+to+make+user+manual+template PDF link annotation
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac408f09a8e---9994511167.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/forigovada.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca5630df57---lavedokomo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609557521df79---39436091294.pdfIn PDF document text
    • http://cecev.com/stockages/files/rumirujexosavi.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/9951098081.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/14896693738.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/85705565146.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a266ab35df1---wetefunugutamedopexapita.pdfIn PDF document text
    • https://ubranni.com/uploader/files/gopegosen.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084650e33a86---16426198559.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/38827746787.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/51317039525.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1256feec32530d353afb5c38eda3f79c/dusaponexadixodarapazunar.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/eh4179h9bvil0pv8l8vatrvla9/kanuliwemoze.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/75533337739.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/faloxarigovidavoxezodo.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/nadegikaxirotibedub.pdfIn PDF document text
    • http://dalaichau.com/files/60564812378.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/8a721725309163c3cf31c345d760a31c/40348845990.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/26e9sjla4jvvmnra5efnph6b6s/vedugirebaxonelidaxideber.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hj73il1gamu301mn8mt5oudpbd/zawamutapubuxodepek.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/96408448783.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p0mvj0h1fu371lm43cff77ned0/vomopivepariwoma.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nul5pbn96mhlvui9p6ajkljeb1/difagupawemovatixanitom.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_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 17532 bytes
SHA-256: 138a37e9fc92a67a347447c9ae6bcf406b2fcd8ae01d6290e372ad42c63bf0ad
font_01_sfnt_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 10592 bytes
SHA-256: 808f2febfa9e91b5be52598f8ef9f551ea7c3a54bcc4f5180b054891b8c6136b
font_02_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1