Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a22c1038745a986…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 02:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e265677275b8fe9217a7c488ad0e44f SHA-1: d142e01f63327e35c1179284b21c2d08281c369d SHA-256: 1a22c1038745a986fa4ba4b56f681b2267b0517e947ccdeb3a441dccc48150bf
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous external links, with several pointing to compromised CMS upload directories and disposable hosting. The presence of these links suggests an attempt to redirect users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fontaine-eva.fr/userfiles/files/lamugo.pdf In PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1532a6a0---20828968789.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/kazataboponazulajiti.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343f815fc1a---sujozinod.pdfIn PDF document text
    • https://suruburi.net/mm/file/72378036107.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130c266d277e---22866356919.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/78465491078.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/kaguvogakuguwuwosu.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/nirusabenefagozosikivo.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/79614651200.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613f34756f96c---89546588426.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/99678545661.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/futoje.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/41383979803.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e785cad89b---janisusali.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/ribirawituxegi.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/72808701929.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/67939122565.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/51692124256.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/sixagonozefekotozexi.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/71398420156.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/gowenapixin.pdfIn PDF document text
    • http://ipublicity.cz/data/file/gaboderowilubupokofo.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210911094907_gvwoxp.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=difference+between+sigma+and+pi+bond+in+pointsPDF 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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 17668 bytes
SHA-256: d346b9fd5ce696a999d3c91a738f224bcff84c37d2de9831282f1dd99a13ec2f
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 11144 bytes
SHA-256: b8b8c8aa5869cef4f072bb8fbdf86a1170060b21d8d8c6437717062e8bcee00c

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