Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cd6a0cee99ab19…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 03:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a6cfb2aaa479812f700ebdf222dd3787 SHA-1: 2ee4cc20dd9553ebac235b0d323edf28e7c68d6f SHA-256: 81cd6a0cee99ab193bdce6dd29d74ebb6268bc0c7d0b18fdf6ef0a8dd7485a66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources that may host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e8d44de60088b118d47461138ffa6841/peroramube.pdf In PDF document text
    • http://kurier48.pl/files/userfiles/file/fasudaderojosanat.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5cb1ae7b255cf695fe5161e43ffa3549/26805944180.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1691a80d9e726d19365693a6cbbc8150/58026521710.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e486c99f6---jeninutu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/024d01be61a7f6fb8c2863bdf88172e5/pifevafosofofimopef.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8c77fc7e97962559c96e6127359175ae/61560150356.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/tedefokilagipiseleti.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/5346f8dffbce75fb4ade96fba05bb043/jebiludegazek.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/16uss925flfbe5ad7u9mb189do/beluwemipapu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a74a12281---ziwagepowozetogivofozu.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/v9v8dtu2m7nh6h27o50u59abnm/jopolusepisemivowinodad.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/nutirotof.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/66735520547.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/wunapelerodaravipizojedi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d268166c0---52566557535.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ac43f1c2cb8ab825957feb8490ff7871/rozigenisijenuvomavoza.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/lotasorikuxererara.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6c1ac52d8ff52128fcf85c38ecdc4427/96202534018.pdfIn PDF document text
    • http://klinok-saintp.ru/files/68518740010.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/p5dfqdvf8ktdhefpc68qp31iv2/75646297333.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/839cfd7131f1b5206ca7527d55be2ed9/1034132602.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3u1e09eo7b8vv5brskkn6qgk8a/tirobagujuwolojona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=listing+transformations+of+functionsPDF 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_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 10556 bytes
SHA-256: f740e7831db75e39cf532b49e95a238e7d64c02475c9a8e5d7f3fbe636f038e9
font_01_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 17532 bytes
SHA-256: 812b319cf099760f0cf4df75a1bf61e7b23f655fa74ba9477fe6e6f606e3bef8
font_02_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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