Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b11c2c557dc335e…

MALICIOUS

PDF

90.4 KB Created: 2021-07-22 23:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8c4a046ccf3635b465c27203015f69e SHA-1: 883d0ef554441f14d3789fcaa08e27e395b9a92a SHA-256: 7b11c2c557dc335e97f432787b58ec745650c26f3b741c04dac3490693a0e958
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous PDF links on potentially compromised CMS upload storage and disposable hosting reinforces the malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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://ideylia.fr/uploads/file/talajabivalili.pdf In PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/b5de82a4f49890725e2de8008174f8f7/wevaverupikazaxax.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/85204176955.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3587ac0f---menuweliwubor.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/adac1dd83ddac01e2a547fa34ddc3110/remejisubumig.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/lezaralakonejulimow.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/22598426113.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/54008894850.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/73048151085.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/33638002977.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/25da26bf7716577ebbc74c2d181cb4e8/9083183807.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/vubofozexujikun.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/o5hnshpde179r1mapl34bibod0/wababurerekativoxasejemek.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/43450127381.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/famalamudipiroxezifebo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a665e67db---22084430682.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d071528f6---91429011546.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a8354609---zubukatobikilegeren.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/17d1408ae6bf88a2d222a82d5d542b76/70092919532.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/zisazipakivurixusu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e6f3650f02b9fd824cf436cf0f511c1f/34188614455.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/35918304561.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/lodige.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ssj2qdhmn7ka0rc1n22lrftsl6/90819961945.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609548cbc41db---kusagenebun.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/388j6lqumlmd6etacai2ngreqt/12406045471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+high+note+movie+watch+online+freePDF 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_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BB 16932 bytes
SHA-256: 06f274ef6d92ed282e32fb8664db6616fa93a99aec8b77ce6aa40e031009226c
font_02_sfnt_off000141b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B3 10732 bytes
SHA-256: d1537b94e2e13cffde097182a1d4c91c979985d04d9ae173dd376a0a878f5a7c