Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54c31ef71f68c97…

MALICIOUS

PDF

91.0 KB Created: 2021-06-29 22:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58a0cdf85d56d8e5b738700949e14a1a SHA-1: 924cc29e84219853fc3797f771f0bf96691bc6e4 SHA-256: b54c31ef71f68c97ee47a358e76d29ee3d039eb0b97da0b445846afdaedec1f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised websites, likely intended to redirect users to malicious content or phishing pages. The presence of external URI heuristics and link farm indicators suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://nomylo.ru/uplcv?utm_term=strategic+planning+and+organizational+performance+pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/32e91c0bc83c7c0acb5d065f36d2b114/taduginojigifewuzetupad.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/q2atp3t0he8vqao3sd88bvh337/fovazebokunuxazirukijoj.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/54061ef79cca5960b8b76c527dffc9ab/38401286884.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c12db775---58538798985.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/bdec2260e525a7eb7fbd9cf12399dc78/koveriwewowuwuwun.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4574432c3c---dalavabokojebaso.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/u1jeccd2kvrqefh75r99peboq6/robaziroxoxexipepizubuj.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/repofu.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/43hqv5g04lmus4jm5q3dlom5uo/nikulararajonekodogi.pdf
    • https://acrgroup.nl/userfiles/file/xidujelozadoza.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/173d3cf67a99d7530df76598cd2738df/fanazudepimaxudujab.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bf767e770---62868749781.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/475054ec8a97dd1518a8e70b876c4805/sujik.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079744fcf45b---lekolijelogojinirirogug.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/41c624542973a8cb086c312d63256e25/negusaku.pdf
    • http://lordbeaverbrook1973.com/clients/76835/File/73563386059.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/63cbe172b953c84e2665ba1b0f15e475/fuzogonuvarojufatomo.pdf
    • http://webinside.pl/userfiles/file/90083915975.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af94258ab60---sotasebal.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/55edd5022cd7a538ead518b59179e457/13077428584.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6e46fcb4---wipuponewufuropiraruzi.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/be51f0497fef742814692042a90281c4/lutezoduzoduxukiguwolu.pdf
    • https://aitalk.vn/upload/files/48098347817.pdf
    • https://hotnews.md/upload/userfiles/files/fapazejodaweb.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/60e1f02737b67ff2af0d5605b02a6208/13108295793.pdf
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/fawadubaxikovowixogorasex.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_off0001025f.bin
e411e3c7deede044c7aae91016835c0188c575f36947bfcaf47d4fa2c3e07ee5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 10932 bytes
font_01_sfnt_off00011b7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 16792 bytes
font_02_sfnt_off0001338d.bin
79bf00ed72006c7ae6f4f1eaf10c9ff93cb5fba88c92ad896134ccc6fc862a86
pdf-font-stream PDF embedded font (sfnt) at offset 0x1338D 16392 bytes