Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c2e5122f39d4e5…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 10:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa5d9f80baf9bc48e47e8238329bda30 SHA-1: 3edc267a96a1608babace0a498cdf46a4e337dc8 SHA-256: d4c2e5122f39d4e58673d3ec4dbe93ae3a8981f27592dd964deac7e9ce8e9173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://servicepapik.ro/files/94036530201.pdf In PDF document text
    • https://factorysales.com/userfiles/files/sipavoxejupi.pdfIn PDF document text
    • https://123natura.com/stockages/files/linatuvikituzo.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202199751513224.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210906174829.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131027d7871a---dewavinofafobiwofewe.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0e808e574ac56c030117f70ab880b853/82231456214.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/96936508131.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/wakitoviruvanatodiguk.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/sozarij.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/tibekimidenepizesuboleza.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/2453608859.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210906_459083F167EF6D4B.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/51040987447.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/zobigi.pdfIn PDF document text
    • http://apex-architect.ru/images/file/56689703513.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/77540026909.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/rosudisusifom.pdfIn PDF document text
    • http://hongdacable.com/d/files/kipox.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/fevitewupufizazo.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/mowirutonopanazalinotor.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/dipumutefeduwigewivi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2431c233---4020028515.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/57828822870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=all+in+1+games+for+androidPDF 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_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 10632 bytes
SHA-256: b8725db4dadddbc482c028373ab73559c0cfe47458641a7fc4ba67543865b81b
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 17884 bytes
SHA-256: a76ee3eb3dce3ad8b4ffe06fd0f399732307690027730304bdc2d7a9ffa0125b
font_02_sfnt_off00012b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1