Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4718161a2c4b8e…

MALICIOUS

PDF

87.3 KB Created: 2021-08-14 04:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 60e880cd2ab6473f407bc80e71b03a79 SHA-1: 1e641604fc76e4e2ccf2f2216a4d3f7350bb0187 SHA-256: df4718161a2c4b8eb4078f25188d496981f5484591da834fcf402f04a4a39066
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to external sites, some hosted on compromised WordPress installations. The document body is unreadable, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hurtowniagrafit.pl/userfiles/file/vogupeto.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/felugesurutegin.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/67036921574.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9636b8656---kelaju.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cfe0b42b485adfb6b8d19a4b966e6821/48472734805.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/ravulagosexotaretuzemide.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7715f19c4efc9012c2493ddf97fd3691/68623626541.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6828d172b2---35984717389.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5bd6250ed---zurisukupefotegig.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610c67fde897f---mexekinobubifiwitegir.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/66959946993.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/tidupoduxusemivuxefepamug.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c79d80837fc---17606892993.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/7033278328.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610107dd8d95a---81909414527.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2bcee8211635d56a68391bdf0d6a9718/xivubakisef.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/61996293085.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/topomizowagogegozowevit.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3151a41a4a0763289a718139fec61e90/36130739112.pdfIn PDF document text
    • https://puppometalli.eu/file/26210225118.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/80162441464.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/69300791903.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c84258144267fd6dfb5f5507b632db9e/vokevudujatafuvapubon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+resistance+bands+grow+glutesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 16664 bytes
SHA-256: feb8d29a0a2cee17e806f4b8a6bca4c91c96e21de19946e4e50e8214567339ba
font_01_sfnt_off00011cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CD 10904 bytes
SHA-256: 8fcc3bf506c856d350706339a35e150a238784e60aaf00c348a2a6a31870fd6c