Malicious PDF — malware analysis report

Static analysis result for SHA-256 9834018aa66eda90…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 09:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35d23a5eb0145f10d7153cff1f2a70a1 SHA-1: 64a319f0e9eca4a42695209e30e9c03f3aa1fdf0 SHA-256: 9834018aa66eda90c9416cfaeb4d671328fb3363e5fbfeea67a6ce7db809491f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely intended to host and distribute further malicious content. The PDF structure itself is minimal, suggesting its primary purpose is to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135866a1ed4e---51449921365.pdf In PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d177412577---bupegegunivexigumixome.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f7fde9f9953b69212f53529f9857dc2/57482936952.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/47501284724.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9c820bb7f---55092047313.pdfIn PDF document text
    • http://livilgirls.com/files/naxupatabigero.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c931dc49447---gibosonemodaso.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/10362098854.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2200bc3f8b---32188794738.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ccbb7974f1---tazosebudububefize.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/norap.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/jipulapemidawuxo.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/gaxusazinuke.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132b843dcaab---zejazidov.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607210dd1f12e---nazeso.pdfIn PDF document text
    • http://skomi.ru/img/files/file/mekefijeratu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819edcc6131---werofudufiwipoganuz.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/mrsdfohgtmm2pr3ov53fcvt9vg/89771971501.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/83014126198.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/motopatekowozade.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b265e11ff93---38854939662.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/94233000898.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba40b01335c---pazujuwe.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/gimupesizur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=macromolecules+biology+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_off0000c419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC419 16532 bytes
SHA-256: 372f701bb27c4c5446c24f33c35c2c1a0ed5cea8af0ad3aa322ce897bb3a1a76
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 11108 bytes
SHA-256: fc6c9395dad95a322ef1dbdf3fc12dff0a110fe2b3cf94c1e6e293203b2aa738
font_02_sfnt_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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