Malicious PDF — malware analysis report

Static analysis result for SHA-256 b164d596a6181984…

MALICIOUS

PDF

84.1 KB Created: 2021-07-04 16:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 309f70057edf806cfbfd6e3e2763f068 SHA-1: 8681f110a9d9df1213e61f358a4b3c7f951a46a2 SHA-256: b164d596a6181984d7929cf95dacf37d8079f63907a90031a58e46931d7b52af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search results. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://pistant.ru/uplcv?utm_term=potion+of+weakness+in+minecraft
    • http://pphjako.pl/userfiles/file/33993057921.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f62043f1f303e32f38a4ed4d6291f8e3/deritakojebujo.pdf
    • http://mhinflatable.com/upload/file/rogapetofuledagenu.pdf
    • https://cargotavio.ru/files/file/ramotezodamulekivejazewa.pdf
    • http://dharmapremipariwar.org/userfiles/file/tobuzizifovuxu.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9c12e095d---64085608870.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7c1aca974---20298734697.pdf
    • http://tfforming.ru/d/files/47834202261.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/61895dfe999f5504e66b4f0203ebcf95/87790354463.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b006ab6c249---fipogofig.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0720d9710e---sokemud.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fkp6dhvv59s27kapta6q6upci3/22178305758.pdf
    • http://stalmont.eu/userfiles/file/gazokoxijedikorilufoti.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/53999430067.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfaa503b51---43807875093.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/cd81186a8e180eea126b526b752acc78/jowolizada.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/73318176451.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/27789858697.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/16159911221.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/busejifalok.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a4b30f8a04907befe68a661e48311700/98172947904.pdf
    • http://osc-pribor.ru/products_pictures/file/13655488637.pdf
    • http://tandprotheses.com/ckfinder/userfiles/files/78282974550.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e377327e9d92dc61dbb0ec28b2cc4c17/muzagenirarud.pdf
    • http://vanharteyoga.nl/uploads/files/88575173999.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e2d9a2d24f1f0c4ff07a8f016d24b25/80886026070.pdf
    • 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_off0000e864.bin
e147875034fdea81d182bf14cd031d3c35943376acbc755512fb2d37f8278af5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 10632 bytes
font_01_sfnt_off000100d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 16792 bytes
font_02_sfnt_off000118e2.bin
e7f87535f9134129d766f361f00cceb0a9a62556714e3a9cbdaff6e144b0a124
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 16340 bytes