Malicious PDF — malware analysis report

Static analysis result for SHA-256 935026f92c295fa5…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 04:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67761c07d23fcbc76f2a802d55a6a40b SHA-1: 9194106f6a8f6ae346fe424b36b1752ef494aee0 SHA-256: 935026f92c295fa57f57319f43179adb7b1f673d894e8ad537e3bf8d6a05e5d8
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document's content, though heavily obfuscated in the provided excerpt, is associated with heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting, likely intended to host malicious payloads. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's purpose is to trick users into revealing sensitive recovery information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://coretry.ru/uplcv?utm_term=from+cer+to+pfx
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/wemifiwexevadebisi.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ffc85fb84---906979628.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/m3jf5709ippu2btngk03cjjlc3/fexokipowizokuwub.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/39e7bc9425b11ad9fb2e61eb4586e973/xidekinosenopidokodojeji.pdf
    • https://alexandrapanayotou.com/web/images/static/file/solitikebes.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/mpppfo4qqnoe6ac536ah1hevah/zisazomosivevotapurufopo.pdf
    • http://myexamadvisor.com/fck_uploads/files/57129239711.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6cb712064---kasipexa.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608200773a0ac---xikubarelekijukef.pdf
    • https://anhhuynoithat.com/asset/files/48709432797.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/nivilisadefemoze.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/p57btksgcpnpg5vjc5qenunblk/girefowa.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ln8vrdbn513a2jt40lrif7ln73/76984011401.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c52736696---25262159125.pdf
    • http://haphadoor.com/upload/files/68191014228.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0e690aee19a1e6f431844d39f5b263e6/sebilijekigumirat.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/c970ef79c3abac6ac8f09dc89b69dc05/vigedunulunonetipimil.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/19284963394.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8866c026ed---vinomeket.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084f72baa235---pexovisuxazeten.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b35df82513---49755229008.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e8f5ab4c4---dapowurimife.pdf
    • http://poslovniimenik.net/firme_data/files/76163349516.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_off0000e448.bin
5e196c4490c3f41eb746812daa6b5774ebd0541cf28135d8259eba22d907b62a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 29172 bytes
font_01_sfnt_off00011fb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 16792 bytes
font_02_sfnt_off000137cc.bin
c1d5e70e810b11d87c880142302633289c2f1559bf6fcbe3f0baf81a640600dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x137CC 10148 bytes