Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7dc59fab6c13b8…

MALICIOUS

PDF

68.3 KB Created: 2021-09-17 02:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2676084e58de15e19e95e756ab536e6 SHA-1: c0124f99a805689e992262287bc514f54fb0f590 SHA-256: 1c7dc59fab6c13b851876fa9b2c8017ff098453dfd5cfbd8ba960c8892c8f3d5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which are numerous and point to various domains, some of which appear to be compromised CMS uploads. The document's structure and the presence of multiple external URIs suggest it's part of a link farm intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=speed+racing+games+for+android PDF link annotation
    • https://tahitotfalu.hu/ckfinder/userfiles/files/9121690659.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/cbbb0d8fcce5c5c903eb5dcc63763d6b/zasodabemubejozoxezuraji.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/xekuzenu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/59c82ec7dbc670eb1ee36475d032b0db/megikiba.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b2db53fb---pefizupikalutelebaku.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/52797902482.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/somuzesizipewe.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/08aebfaed6a3509ced4e5aab9b3b5b42/36373906416.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/natigalig.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/69288954273.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e70a421bb5---vezenogenilavux.pdfIn PDF document text
    • http://www.heksan.com.pl/file/39516245731.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/tulonuwidekukozikexuv.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/gipobawisefedubatemowuku.pdfIn PDF document text
    • http://baoveantam.org/upload/files/6068549347.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/31879107173.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/kezigu.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/safora.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/7443048584.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/fivinenomadipa.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/29c5cea0d1e07b36cf3c20e21d0ceff7/75953128628.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_off0000b015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB015 13988 bytes
SHA-256: 0d37e446ab733886133bad7caa28d4149fbc408e12466b29b589c2363839d054
font_01_sfnt_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 10896 bytes
SHA-256: b26e45998befdbe1479e11f1b95a062d7f587a5b5a608fef582557558d66c8f9
font_02_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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