Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfc7d0ebd5f7c7a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 13:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d34a05edd6be67d83386475a44e421b SHA-1: 837b7df9ad884a4ca8e1b15e9649f02030d7a04c SHA-256: bdfc7d0ebd5f7c7a2eb80499a7749cd861c81e10e64af218ecf31500102c4399
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URLs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=the+road+driver+truck+and+bus+simulator+mod+apk PDF link annotation
    • http://hebammenglueck.de/ckfinder/userfiles/files/15316396990.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/66382692536.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3e91994fe107ba0fde70848699096529/tafavinud.pdfIn PDF document text
    • https://kristinanamaste.eu/files/42997487176.pdfIn PDF document text
    • http://only-svet.ru/upload/files/90930653471.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd3316607---kipebuxotimoju.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/sakaxokabovomemevaj.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/wamopubozesaviwudisi.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/23125100759.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/9751380431.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd2d0a0f0---jojepazabizitobewij.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/15951840355.pdfIn PDF document text
    • https://maturana.cl/upload/file/xixexuzugow.pdfIn PDF document text
    • http://saint-party.com/media/file/74855453584.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/perolaworozomebudidajek.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8b88510dfdac9192b6595d641da02eb9/gidofuzekaliratebe.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/40994047429.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16136a1a50d221---54240049516.pdfIn PDF document text
    • https://premium-house.uz/images/file/33999461088.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/28224705081.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/93017237954.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/24000662268.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/38392026993.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/duvonabokojalawunigafej.pdfIn PDF document text
    • http://home-plast.ru/foto/files/tafowatep.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/92607245161.pdfIn PDF document text
    • 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_off0000d1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E5 11140 bytes
SHA-256: 12a96af39c5a5af1d0943fdca0a27b6bd94bf3c7bc39fdf22bbe74b008930010
font_01_sfnt_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 16832 bytes
SHA-256: ae287c3bb05654ea42f8e185b31adc31037b48bdbbb56383153a2ef2917d6d60
font_02_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1