Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff22693500794968…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 09:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63b2c269e71a4ff2b4368bb57fa815bb SHA-1: b3cd112c9a7358bd5f4a7a2d461ef0f20821a795 SHA-256: ff22693500794968749268e6274e6bb361b9e41d5f643f848d910a59c034feaf
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and other potentially untrustworthy domains. Heuristics indicate this is a link farm designed to direct users to external content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://colorfulmedia.de/fotki/fotki/file/81786684855.pdf
    • http://eiak.org/upload/editor/files/10136522298.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8671068322---36082174129.pdf
    • http://alexlunacoach.com/img/editor/file/63504993131.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/30eaab0195c65328d88c2e96f5fc7c13/51276784881.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dda76b12bf---xugusoleno.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd83601d3---nalifo.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nagiguzijijojokat.pdf
    • http://alexlunacoach.com/img/editor/file/sozinebobopotix.pdf
    • http://alexlunacoach.com/img/editor/file/mesulif.pdf
    • http://celcg.pl/uploaded/file/luxodevezigosibas.pdf
    • http://bigsvatcharasith.com/userfiles/file/misorupisawigafoporoxuluf.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/ruvewumunubikijemerimen.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4d2ea4428c01ee7336a684f8ca299860/9037070486.pdf
    • http://chouchoudauphongongtay.com/upload/ck/files/vitotowapasilawuka.pdf
    • http://simonhoirup.dk/userfiles/file/75964884038.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4e2ae1d532a65309c62a5d9cd5ca58c9/viwesavaxurotirawux.pdf
    • https://jerseyshorepirates.com/userfiles/files/12347598493.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4468063613986434ba657af16b99de4f/31151469595.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084720b1acc0---46550518602.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/4ee4a96f2c0301ddd6911962c4a69c73/nubivunisekon.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=side+effects+after+anaphylaxis
    • 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_off0000efd9.bin
c0eed1733886d5df816e3e546e3e43b85d1063ef5dc7a9a35146ac94c9e46397
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 16512 bytes
font_01_sfnt_off00011ad6.bin
811cb55fe2a6bafba116db739801bb162aa52b31032e1c00f17fd2680c2b9d77
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 10888 bytes
font_02_sfnt_off000133ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133EF 16792 bytes