Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8347a21353f791…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 13:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c83a3a9d1bf5b771f5fb07a1fb491914 SHA-1: 8c71d96c591b1f17abe0401f847a2358deaa2174 SHA-256: 6b8347a21353f7919365eb0d86dedb013a45f649826b1c055202a13ae65aaa14
156 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The primary goal seems to be directing users to download further malicious content from these URLs, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://mnogonomerov.ru/uploads/file/punitowuvatifisaparoz.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141a468cc8df---95033037957.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/68463519061.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/46286718342.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/tiwunifizol.pdfIn PDF document text
    • http://newmob.it/userfiles/files/2721815750.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/talofejigizunoxari.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/33294430076.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161355c2c569fe---40760490799.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/37298316566.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/10679506750.pdfIn PDF document text
    • https://cartolmania.it/file/57214009479.pdfIn PDF document text
    • http://equalitas.es/userfiles/file/52031257780.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/89948376873.pdfIn PDF document text
    • https://websbag.com/uploads/files/joxukenadejufigitoka.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16134b94232f71---50227856390.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/70611835358.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/zurenikipa.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/soneginarajamoninopewareg.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109121426547029.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109130721423372.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/fexifakurakoza.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/64708048033.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/xigikosabanubupaleli.pdfIn PDF document text
    • https://akconta.com/uploads/files/66325943970.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/57037388638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kafka+on+the+shore+ebook+freePDF 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_off0000bc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC83 16904 bytes
SHA-256: 06bc28030a2c19b7077587255a20c6fc641d4517806ebe324bbe5557e715b8d5
font_01_sfnt_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 10396 bytes
SHA-256: 9b24304b3f545a7c82bf33385af5def97de1223ba8e023e76cf94543835654b8
font_02_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1