Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2645dec2f6ab23a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 10:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84adde8237fce36ff1e8297a438a96a7 SHA-1: 30fc726e6398b05a76f7d213b15b17a6a69af807 SHA-256: f2645dec2f6ab23a80a925e982d459ee367969646530fe3b874b9989ab82743d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/84b55393f76cde00bc475d6b8137d0d2/zubujem.pdf In PDF document text
    • https://imihwa.com/uploads/image/20210904/files/20210904010044.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/letupofejutaxil.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/69465528317.pdfIn PDF document text
    • http://mega.kz/media/upload/files/85284016414.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/jejilup.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/19392032358.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wanisotekinexegiwe.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/diwulefitikixemi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/535f2d24152445611807722784ab3491/kifemew.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607145ed0ed40---38991740708.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e569beb6---gogifozise.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/zuwukixilovepili.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0c2a56c6d4c453d0c1b00de2d7cd0e25/15074176539.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/19664297425.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/52c3355f018617f69747de53ba136eab/79914057311.pdfIn PDF document text
    • http://chpcentre.com/files/file/vulisopipenuzizumonon.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/ratozonule.pdfIn PDF document text
    • https://bfull.ru/uploads/files/14947937103.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5caa8631d47d684ce6bfadea65526bd5/97236436056.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vnecfhal12js6ta697d3qeih21/1938206484.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/labazimuwutal.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/47693750552.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/712838bc6d2c7684f0cb76441c93ba84/58872145195.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061908002270554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=concrete+design+handbook+canada+pdfPDF 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_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 18576 bytes
SHA-256: 31937ead35836ecb4fb463f340633a59ce0ef3878d689bff09f4fd276ad2844a
font_02_sfnt_off0001294e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294E 11116 bytes
SHA-256: e371acd0eb29198ade37cd9fa3ab0271c24adbfb185219a7e6aa80a14b007834

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