Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffb7c1be26f38c1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 07:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aadfb0427e87495755c76997b228c2d0 SHA-1: d98afd7061d20da72a75f0085f659480ade4e97e SHA-256: 8ffb7c1be26f38c1129465f3ce34c79a41cfaf332dd1f514b39d86308fac874a
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm structure, with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this 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 http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/lcbjao5a71ape1rp4t2qt1m5s5/lixifaxevolajuzemunu.pdf In PDF document text
    • http://venkateshservices.com/uploads/pijeg.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/10346918423.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/14901517518.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/vopuke.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/8329270921.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08bc89945---pemenikil.pdfIn PDF document text
    • https://coil.hk/upload/files/14383295160.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/98229409763.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/xosalifat.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/pokixobegedexarozuvoseb.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/35059826968.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/jakamalopovo.pdfIn PDF document text
    • https://best-label.com/upload/files/taroxesuzipufivaxetegafo.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/favovizaseputupobopefun.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/zidatudomekosurazobewa.pdfIn PDF document text
    • http://telektrans.hu/editor_up/xofemegozela.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/tidoman.pdfIn PDF document text
    • http://kisito.com/userfiles/file/xorubazasowiv.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/03f0da0a344cf67af436a1775fc11e53/fuzuxitavegurutebodutetex.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/93666368586.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210831_200344.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/soziwi.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/62056268673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=spheres+surface+area+and+volume+worksheet+answer+keyPDF 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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 11328 bytes
SHA-256: 78b58812da5152b56507fbb8d88ff5c09275da38e8447558fe4fcd1b6ef9d8c8
font_02_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 18340 bytes
SHA-256: 36b2cade7c5e3aef1183281d7e5c2aa282761bdd9406ec670e7cbe721895fd60

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