Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d73756547f7174…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 05:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cbbe5576e84dbccd5ddbdc29a8342223 SHA-1: 3dc4821e1213b5426a1c164f4bba42562f36b275 SHA-256: 41d73756547f7174b21de145cf9c43839c079e59381e0f22fd89700c68c5a87f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is part of a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=modal+verb+would+use PDF link annotation
    • https://lepjunk12.hu/uploads/files/50101138382.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cfaab0fef---67584561072.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/91821807595.pdfIn PDF document text
    • https://mytopics.it/uploads/file/senizasiretigawoz.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d8bb5c289048e4a8e1bd953f39ae326d/21993756983.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/zilibeb.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5860d41d3bbbb992872f2cbf7d617790/kelotoxozuxawaxizupudu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8404adc2b---45004365483.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/wufaratotelogupid.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2075ab3bc8f00003a3661355033c680f/70978212446.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e6e3d195---letoraxuwuzixin.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41defc4b5e---16181930632.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/7243541660c7b208d84c9.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e3a637c2a928fbafb10ddb5db23c6af9/4829377269.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083e241eb9ec---95461197861.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b1971ce2b6729534333b6705a3c32f27/wenivozumiju.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/70447533156.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/12734419784.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090fcc6be14b---zoriwadimev.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d4fdc9e4---59420559667.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843d58b465f---pogerubepexagexubogapefut.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d30190496---wanigalefemag.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/xutolefebusafene.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc17766d241---xaweguji.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_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 10332 bytes
SHA-256: 8226bfddd9bab3292697a1bd6af9418ad3cdd7e6e88ee4ded5fab8ac3c310b62
font_01_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 17224 bytes
SHA-256: 1befdfe8b632912b188e3c6334220e5de07708ab35bef6957629e30765967b21
font_02_sfnt_off00013778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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