Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1414b5f5854abe5…

MALICIOUS

PDF

86.6 KB Created: 2021-08-21 07:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52a1939a8627550dfce61fd452ebce17 SHA-1: 603ba299a41a7d9300b551e5ccae361521bf17f5 SHA-256: a1414b5f5854abe505b6db991fbac1ad6aab160b3e1e3ed463785e466cd70a0b
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV. It contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings strongly indicate a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://thephinhmienbac.com/upload/files/10559044050.pdf In PDF document text
    • https://bitree.com/ckfinder/userfiles/files/desawa.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/81442250559.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/birodovobuwuxesa.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3c9f57eb1268a4af0cb9d98ba0c6760b/besugopejilajenorijisubu.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ninavuxipamaxepejili.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/tuvoziwatagevunudebe.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160975292d2bd8---naliwa.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wamolomisexomusika.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/426b8aca03b68e8505f6ecb7a29f3ec0/dalodiguxaropijek.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f3635ba8b357e3a5976d404c6b970742/xumujokuxalofikamudam.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/k9gbc3re7ive7jl5spa93ie536/vubodesulibalasujutoperud.pdfIn PDF document text
    • http://sns.hu/_user/file/1540755399.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107040912407307.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/75593761365.pdfIn PDF document text
    • http://szwygs.com/upload/mexuropeg.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160790b15ed91b---kulijug.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/lenevoxoxavef.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fa127bedcff81bcb764b2bbcdb143170/3607081926.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f70e830fc---patagi.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/38553114210.pdfIn PDF document text
    • http://guitarenko.fr/img/files/kapewa.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607792e7068c3---bawaveruraj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+fake+gps+pokemon+go+2020PDF 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_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 10872 bytes
SHA-256: 06577c9c778ed116c6cc59c6fbd41e37fba730d4972ad02f3e39a4cbb90e4514
font_01_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 16840 bytes
SHA-256: e8e4c3e9053d0c5882cc06e914270d5035ec8772bed0212b07514bd7db5567e7
font_02_sfnt_off000132c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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