Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cac1768543faec…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 13:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1133c83e255debd72b090063043a9d1 SHA-1: 12e3f04fe1a8ac2ade4b90b7dc4df5a6659afbb4 SHA-256: f2cac1768543faec45f6e4a7672ecf83152f87df2fb4918cd36f94800add0e14
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to files hosted on compromised WordPress sites, likely serving as a lure for users to download further malicious content. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e114c9512---kifuvarotenatikuzorixepo.pdf In PDF document text
    • http://libertyquad72.fr/userfiles/file/refejilagelararilivagifo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e345b396004---fezuvoroba.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be0fa70a2---73344377071.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/119766639860922975d9c12.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ee90382f3d2ba4300abdab6770cd5967/69564666695.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f44f08bef0df6522545a811e6c62a60f/6439882547.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/21756637022.pdfIn PDF document text
    • http://mextro.de/upload/files/36806232551.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/gavoxuzoti.pdfIn PDF document text
    • http://santeh.md/img/files/14682642915.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60def1c9---ronaw.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/zixefab.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/labijud.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/4b62719a6f8a66f1984d827fd2b293b5/petakefadebuk.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/belovo.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/34169089752.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/pavimerusivo.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/similu.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/jozuxuzawuxamixugopu.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/72679044234.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/39509647685.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/937b09131179d71b12d032d7a03ac907/31540387314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=informal+report+example+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_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 10452 bytes
SHA-256: 52643a198447e2d9db3c9bf1f2600fd1dc5f0aed80930405f81cb724c577d315
font_01_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 17536 bytes
SHA-256: 5d3041f570cc72090aa3ac847cb3ecabd0b48c6bbfbe110aa52557a1951f1ddf
font_02_sfnt_off00012f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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