Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17777aa812b1d51…

MALICIOUS

PDF

100.0 KB Created: 2021-07-26 18:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a46c4abb2d34debdbadb811f8eed1797 SHA-1: b5c4fed479ce6d8525c63e4aa1a96f19edee5dd2 SHA-256: a17777aa812b1d5137eb42ac3a52580cadfbfbd2c0574fc0c89743c86c279bcc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65ocq4o73vg5i0p3jm3vb900f3/deteju.pdf In PDF document text
    • http://mariopresto.pl/userfiles/file/97894970113.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a9b99681b---93418598715.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e6e240934e5bd44a871f5282ba9eaa2b/zefexoxil.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/082007425198.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/sowefirivuzivonowax.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/duvakuruw.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/la6bs5lovtrpbjg24te81ir4rn/komawo.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/69140328606.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ef26d8b465a7e54529334bec3f3e855/wezafukiribatipadonigorat.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/rirusaxotutidinodimune.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/musav.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/fobokejavol.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/ginimipazolupofexan.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c57a2105f0c---44592744586.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160992320478ce---62755949425.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/emma3tl3ravh737rfj2ikuqhca/razatululezusoroborase.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8d1bf3fd397580b7ef0075f2b7d96275/peneliruru.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/ee458bad36b81ea8c4f0e282bf03129a/xewisudexutowem.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bq95o5mm9oq6luikuapfv4kck0/menuzopinumakobel.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b22c6ee440---41955356980.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7a4a47e7---wawegesudovanijiv.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/57295323465.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89kdf33b4t8tdar9855d9e5ec4/16266167297.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/96276855063.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/aao3rcb0fl2gn84j47bdtlf86c/95409861745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=guitar+chord+chart+finger+placementPDF 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_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12647 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00013bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC4 11036 bytes
SHA-256: 8df152099a64a181e06723451cd1e968b661204a4ba0a4e420d5d669d1a41b89
font_03_sfnt_off00015507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15507 17204 bytes
SHA-256: 81461ed227d128cb91a513d5282c03a21a8d24e0856d6455b2a7cb9783be5171