Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d841db138652c0…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 16:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18dc9e3fb474abfc4c3ee0b95b29d7d5 SHA-1: a7fd0850c8a0545ec890d35583b1eeee95f26e5f SHA-256: f5d841db138652c08c17dbbbd64b110d7b1788ca37e7f80f7ec85d0eedd40c1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The file's structure and link farm characteristics indicate it is designed to redirect users to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://driver-jazda.pl/upload/file/wawofekasatonasu.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160795d5ca5ba9---jixafijolawamivukagepo.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a746ba7830fb611790ab0bb402821b91/22562740577.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7vs4c2relbcgojkkpm7ktgbp57/pezuvigonap.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2897b11951---51230269694.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/03356005ed43e859b6dd14c29191abc4/tagiw.pdf
    • http://briarcliff68.com/clients/71184/File/91241841896.pdf
    • https://avgdesign.com/userfiles/file/konawoxesiwiwiwovazu.pdf
    • http://plncse.hu/php_data/file/45417236549.pdf
    • http://fresh-j.info/images/uploadedimages/file/49192406937.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e5t1gj3mivlthrap5mjdgd8u0j/gumekovetowufujizase.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/b9j0tpjobq0c16rli4r867pii5/pimulutadedisogolaboliw.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607540c22a1e3---19857257541.pdf
    • https://et-auditing.com/userfiles/files/27814090098.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc4bbad0fa---nogunorebasuxajewagi.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726e37c641---37433778921.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7c0ce4465a1302e48ccef7f4938ac17c/bekerowebiri.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tgo2s9tag3qoktjm3k7gq9somm/5457231777.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6376545b93296eb998219488af5aa57c/92305179982.pdf
    • http://simonide.org/userfiles/file/zuwunonezufe.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/978941e6d1b5a6934d4f67f5588e8e7e/30456737596.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/oimvc2ltftv09e6cmrci4s3l3a/47023149795.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c94743c992d---majigunapidasepifezu.pdf
    • https://avgdesign.com/userfiles/file/kemogoxebu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=clear+sky+quotes
    • 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_off0000f653.bin
a74f884e706691880b65b9d7cf5368d9de7147032d691472306618af0506376e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 17868 bytes
font_01_sfnt_off000123ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 16792 bytes
font_02_sfnt_off00013be5.bin
2e24f1d7602cb56a47e2bc8bc99c9c4b3a3b3a1c65bf5d5082d119b3995a89b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE5 10388 bytes