Malicious PDF — malware analysis report

Static analysis result for SHA-256 167b52feb02cb063…

MALICIOUS

PDF

75.7 KB Created: 2021-06-29 04:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fef3c86f3aeed91abb9d0920e7f44af8 SHA-1: 6397fe31da0d48c6025ed3ec357ac32628f46642 SHA-256: 167b52feb02cb06303bedf70d5ec9496ad629a483a7394968324dc560b662f42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The presence of external URI heuristics and the link farm structure indicate a likely phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thesecurityguardunion.ca/userfiles/files/jawepulavimemozesijudori.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097d235e30b2---zilorojojexawamemunoda.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7f8e214d---bokatubapin.pdf
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/xudeku.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6cdd21e3bf14465088a662e07a2c0f04/43979282119.pdf
    • http://gocreate.termall.pl/upload/fck/file/10716722917.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6ffa2ac3---rafuxiwifapemobozoleliv.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e226155016b06be2f29c231b1a4aade3/nofilesivev.pdf
    • http://mikomisushi.com/uploads/files/fagonorexelozubiripomen.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf05c829ea---barexofarovojijo.pdf
    • http://imailbox.nl/images/uploadedimages/file/gaverorozawepilepif.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f6c1443bab0c6f1763b942e63b034dad/lupamajibijukujo.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2578ec37a---jetuxatumuvu.pdf
    • http://inter-travel.hu/_user/file/34402562079.pdf
    • http://korvet-sp.ru/userfiles/file/54473413190.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b25aea77---modewa.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/pepemotakavaxokepolibojo.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/97e657db2eccd102a869d6183846efd0/76958983255.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608103e669fdf---99843615540.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/9a799c90d57caa38a1845e9960fb91e0/14820613483.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/uhosnkml8rtndde3qjib1e14l1/wanin.pdf
    • http://soupworld.de/upload/file/xafokowotutitedavegodo.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/n68nmfb0d07g5k2o9ktupbq70t/pekinuviben.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=piecewise+function+example+problem+with+solution
    • 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_off0000c2bf.bin
d6a72c3d15e2d088fec961f5839b0c5683959d26b82a10ad4ac9859b2f351ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BF 11172 bytes
font_01_sfnt_off0000dc90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 16792 bytes
font_02_sfnt_off0000f4a2.bin
527f8e0205a16496d4467e86d99246e061deecb13249c4ac61c735a3b08f5249
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 17128 bytes