Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b9b934dbd3730f…

MALICIOUS

PDF

86.5 KB Created: 2021-08-30 18:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4f86fa67560d923da3952e2a7b175c6 SHA-1: d4f44394d884a78293dcebff764b8eb79a40d4e6 SHA-256: 07b9b934dbd3730f2b52576c1c128bc572a90e59e4f75add1c972ca2dba427d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting user trust through a malicious document, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://synerhu.ru/uplcv?utm_term=cod+cold+war+next+zombie+map PDF link annotation
    • https://tenfci.org/userfiles/file/xedomepapopunixuzulu.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/sapabajufifevuladefiw.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/10701062489.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075038c45a22---69679582689.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ac96acb45---pukapin.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6fdd732065cda32ea98148c611c24692/kekolerininokapuxuto.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125c35e310cf---kemonetapulo.pdfIn PDF document text
    • http://africareview.in/userfiles/file/zidikurufenibagif.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1610000a59b59e---74756700687.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ae7ae7a5a866e1065178d58dde9acd01/77331817440.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/45978195325.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/51884547416.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a62bbfe69886a346a53c9d15338c509e/83679846661.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/88233847857.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/pifil.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vajefona.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/vitatimagalona.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/dibomuwopebosomim.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/j2tvqj424sm1ljjjtj5lhmdt5o/89643041951.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a9fcf3e7e---52383506561.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/66305221383.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/20265131578.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/ruroxixusoxuga.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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 18720 bytes
SHA-256: 5cc7978309a33bf421133cd9dfb0858d27b93c56f33079541858eb91e7add6c9
font_01_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 10924 bytes
SHA-256: 72ce6749449c8367b990baf828c1123eeace14d23bea6bc87db4eb22b9f8a751

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