Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf981b65822dec2…

MALICIOUS

PDF

93.7 KB Created: 2021-09-17 03:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a10e01ee8db44ca571ecc02b4b500cc SHA-1: 94525ee8e961e719b99f6c3f75615606fc6e36a9 SHA-256: aaf981b65822dec253d0fe28d363183eab55e7fecded603adb593d8e6c19b567
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/lirabimuxodejakasuruxas.pdf In PDF document text
    • http://tobn56.com/UpFiles/file/rilejozoxaxete.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/kuwewopojinodiruforef.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210914084503.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/847hgpmgn7mea8fhpvv730bp6u/silurojelemugisorin.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t7ksgbaukpuno35rv5v4cs3evi/3526952548.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/15366951752.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/34129338298.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/miwuwi.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357dbb0f29d---gifezigewafipinup.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/wubajabi.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/puxut.pdfIn PDF document text
    • http://ruihuitax.com/files/file/vepisotowokosedija.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16143c32d4fed7---fabarebomibivaboduva.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/timiluwowujetokitekusi.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/37063219950.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/mojixim.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd21b67eb---silura.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143af6bf11d1---rumabapovivefefafuxume.pdfIn PDF document text
    • http://hnspkjx.com/d/files/vamifejibiguganogup.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140d7b70b213---30610394144.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/66190757748.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/64767044923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=muddy+heights+2+apkPDF 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_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 18332 bytes
SHA-256: 445f3e6337fb9400603875736285672c09190ae7bf0e3c57006cb533db09a113
font_01_sfnt_off000138d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150ED 10720 bytes
SHA-256: 59e0a8cd818248485d6c595bda9dbb209c23e741a3768532d5c190cf3453714d

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