Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c952555c1e883d2…

MALICIOUS

PDF

90.8 KB Created: 2021-09-08 00:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1413fc0a48308c25aa3b31e98d3d54c SHA-1: 6bce55961b38b254990384bef6037ab1e2ce58d4 SHA-256: 4c952555c1e883d21ecd02494c5eb3018e32b7d49a5289effe0449aeead802fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to various domains, many of which appear to be compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the presence of multiple external URIs and the overall structure indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://healthmatters.me/userfiles/file/mudowagasaxizagejisegim.pdf In PDF document text
    • https://hoalavender.net/upload/files/bawod.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/oslb38dcf6dga8dkp8apmhcqol/vadesumukis.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/65731303146.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/132f7c11a2f2d4373ecb0305f447b3e3/sorojilidan.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abca71789b4---16821699470.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/jodena.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b40bc8a99---dikamuxolobulorewaf.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/tibusizumumiwop.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612d47af98e05---wufuseguteloxeputu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160852faa55677---dixediletukogasonatenaja.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/sonudugolaligakoxu.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/fawosopewukemixawiloj.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1538bdb4---baxarolovug.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/lemazimis.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/7jel2712i4o7ifd0mt93001322/87493838677.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b53554668---81085784162.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608230a70f587---badebavopogonelojej.pdfIn PDF document text
    • http://ktcz.eu/files/files/vagesirerixa.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/mapagozigur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=beethoven+sonata+5+piano+pdfPDF 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_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 19904 bytes
SHA-256: 13f65b3c12a200e04c8d5c4a5bf5b78c051d9b475e74d319a0259143703bd17a
font_01_sfnt_off00012d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1C 10704 bytes
SHA-256: 7d5f49ca118054a7f7030b02ca0957198daf4eb6ee14cab361608a1c3e48b78c
font_02_sfnt_off000145c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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