Malicious PDF — malware analysis report

Static analysis result for SHA-256 591c67f99cad5535…

MALICIOUS

PDF

94.4 KB Created: 2021-07-23 22:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bfc345beaa8b4f6b02cc722fa202eeaf SHA-1: e17f53111e364a45c2192ef50b3fb62a184d6824 SHA-256: 591c67f99cad5535c9d7f6232308218ab5cace32d9f13c0ed6daaf1f7d5aec76
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The PDF document body is heavily obfuscated, preventing analysis of its specific content, but the presence of many external links suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b1bc49b1d2c0cef3f54b8c79110f91f1/viminez.pdf In PDF document text
    • https://atl-50.com/files/file/jejasorozetoromipewipatu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5315681e5---72727850912.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vnelu5mjtk5h4st97rdcbdnhk2/gubinabovegebidaki.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pelawul.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/makive.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/10275576124.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/60800221121.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/lipojaniwisuwowowebelita.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/luvedujumajatekidu.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7f3bb8a43d05ed92c08baf0b0ba5a3ca/zezojopadulu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/36db283jbl3b5mgfb3biavdnud/95014942870.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/92953008468.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/fartqiai9a6hb4c0i5ephereri/didexiratokemawifev.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f39ed878e---32860495023.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/fozakaxulisimemorogupowe.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/pabixekiremevepidubokowu.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210703054428.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7241feffc687c85bb11c29b20743af6b/12628142849.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/bdd658fe4e87a635500428b426d2889a/57589957873.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/24306509385.pdfIn PDF document text
    • http://bscartridge.com/pic/wexerujofotupukadedef.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4879616944ef09cb94170944a0fff1df/17318977171.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf42bbd30d---dunijoxamusiwode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+gba+roms+with+gen+8PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 11036 bytes
SHA-256: 33c50f616a8c86aa64979038be1d7bee5ea09f56ea5b7aa9ba465ad06adfc8f0
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 16156 bytes
SHA-256: 08948431f08716effff9f8d666841fcf418acedfa942d76c07bab1b94409733a
font_03_sfnt_off000137f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F9 18728 bytes
SHA-256: 39b841555531c35940898d823658b0f8780d54a0a4c51d976cd9a20576a6a850

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