Malicious PDF — malware analysis report

Static analysis result for SHA-256 38922c193cb0d4a2…

MALICIOUS

PDF

69.4 KB Created: 2021-09-15 13:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 296f404cbb656ba960202a7eaee390df SHA-1: 9dbd27b4536bc5682c923b2992754e8c57ccc97d SHA-256: 38922c193cb0d4a2ed01faceafc9114bddad059d3c80eb3c7896ecd544bc0301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, which likely serve as download locations for further malicious content. The PDF structure itself is indicative of a malicious link farm designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c48d717ce---nusuxub.pdf In PDF document text
    • http://mt-filtration.com/uploaded/file/2107370194613f8c9416306.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/38164377366.pdfIn PDF document text
    • http://seritour.com/rsm/files/bilegikeruxamivekunawomos.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6a89a2b2---94096765207.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdb68415b---76537619418.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/jokulexe.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/59576569416.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/60292104353.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/28763512082.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/xiraxiwaronolavimupimi.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/74295452917.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/83873278825.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/mavujimurotutiranaxup.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/94893621585.pdfIn PDF document text
    • https://anandalaya.in/resources/file/85802797316.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/41650230001.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/mobinarogugowina.pdfIn PDF document text
    • http://opsir.eu/files/file/33700927093.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/35883891531.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/15419304405.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/kisip.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/desewesu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/96659295062.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/53871782636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+cast+your+phone+screen+on+laptopPDF 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_off0000b1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 14848 bytes
SHA-256: a3e6dd0e43b6bbe1d0ea49dd5d2953d1cd09051cf82dc92ac50fdc79235c2520
font_02_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 10668 bytes
SHA-256: 8b01bdc910f00a0cb49dc3f33192968111bfef5a1972e35a45260be562e41b0a