Malicious PDF — malware analysis report

Static analysis result for SHA-256 571d52666debc090…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 11:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8776c189e022c292279bd01b17c7ee39 SHA-1: ca70a16b59ce787872ec87b7b7d01c99ec17ba75 SHA-256: 571d52666debc090616901c2b2b8add7beb63e42d1b79fedaf239a1e830b52dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tpdw.pl/userfiles/file/32803737714.pdf
    • https://abofahed.com/userfiles/file/vumosevon.pdf
    • https://pharma-tools.eu/galeria/file/gasamupuvisu.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cc2f5a4793a418e64076a905d3df1538/87721157692.pdf
    • http://chinocorporatechallenge.com/clients/6216/File/lijikugeforebedoxo.pdf
    • http://liburnia.pl/userfiles/file/gafiroxero.pdf
    • http://serextion2006.com/js/upload/files/70053367397.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/76dgao4rj5entu1q190j0mflgd/9716205105.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75e385ca0---47767017409.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/jasebaterutape.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5cf983e52dc8485c2247d7640d8bf084/fejenoburijirov.pdf
    • http://www.ferm-matic.fr/upload/file/95235470097.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4b2cd16a---xerigikikadazuzapemak.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/koduduzibegesinirejef.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d81e23aa5---68590016083.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e14fb3c9e---32872040622.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078676217c12---selisesozum.pdf
    • http://kolasinprevoz.rs/slike/files/fukizaluxumoretadonivar.pdf
    • https://a2designbg.com/userfiles/file/27727234236.pdf
    • https://rinducm1.com/contents//files/20988288656.pdf
    • http://cdmatik.com/uploads/file/52878771688.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608880eb00463---wojajegala.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/nml65d2mklngipbkaddc3ejhq4/78725343350.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ina+peanut+butter+and+jelly+bars
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a0.bin
cc90c0bcb0cdd015ff9dca4ffc7e4e8dd0db3265881843288075b27e5c6180b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 10608 bytes
font_01_sfnt_off0000ffcb.bin
bad783b02fa8dc73598ff75f41f6970cadef440f4eb384ac107c646560610039
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 17540 bytes
font_02_sfnt_off00012dbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 16792 bytes