Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71e7ee637414515…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 05:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 934569d50df34a97289b4214cbc42a29 SHA-1: 8734111153766821384013bd531a6990a3d64ff6 SHA-256: a71e7ee637414515e909f72b016aaf046a858332b8251c21366578120e4e7268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b2c8d9a4f---38769251872.pdf In PDF document text
    • http://thermcom.cz/userfiles/file/41979097921.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/93258377575.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/getuzujumojisetukiduto.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/14292894267.pdfIn PDF document text
    • http://susutour.com/userfile/file/kajorin.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16136402e0daaa---sarixofoz.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/ratarabolat.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/narapuvazugazinizexezef.pdfIn PDF document text
    • http://ropesadventure.com/d/files/surizapususotibijupe.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/raboniperanepibajafoxar.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/felagatavubamiz.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/polaxerozepup.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/kisewa.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/vefogubunuwu.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/88379389881.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e1b157748e7b8fbf63c4f70c2749357a/safupikuzovan.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfb770904---mujezasem.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f16538cfc4---47742913279.pdfIn PDF document text
    • http://mobiliteit.nu/files/9019337617.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f6fe83f70e0ac27326c949946be78637/27899094908.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/pikifalurofov.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/sezemoxele.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/34763118668.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/dilofinebenikexojas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=midsummer+is+full+of+love+ep+1+eng+subPDF 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_off0000bab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB8 17040 bytes
SHA-256: 5a1de406bd1212bb7dd08c8dc93a1733f625aacb085eddac3c44f82f4e79d2b5
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 10932 bytes
SHA-256: a52fbb1e11b791d9ea006759c10bc46bfa4b25e0963d4bcad2deed07ed8f4420

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