Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8954e7032fe2f57…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 12:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c06fce87a19241fb4c2529d4736811d SHA-1: d40f9b9f54770621e3cd49f01421c26d78cf7ca4 SHA-256: c8954e7032fe2f57879cd0966e86c945d5176c2f14cde5cdcfa6b457f7276732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or hosted on potentially compromised sites. The primary function seems to be redirecting users to external sites, likely for malicious purposes such as credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=best+app+for+mirroring+android+to+pc PDF link annotation
    • http://rlmlaw.com/images/edit_images/file/77030795964.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/54871290055.pdfIn PDF document text
    • http://hidropro.hu/upload/55524131780.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dc43e138---4093062431.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca36e0761---dejolesufugagunisa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161363f3843440---68693632850.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/fowofosok.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/67629575608.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/nakajedaneme.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/86242570409.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/93331065000.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/2169890812.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/5g9qfkal2n86fd6d6krqc53q38/90995587104.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/ranuzukiwidumalevefapesa.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210913071522819879150.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/jesawujebomejotituj.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/51741814316.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/65710425325.pdfIn PDF document text
    • https://parkettworld.com/upload/files/valezawobowasiger.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/mamenadisibobosikarogagu.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/66774808131.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/lutojilogikisu.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/fovofokapojotevepasi.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/65361121828.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f58265cc94---74890274468.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040d71beb4---18784445387.pdfIn PDF document text
    • 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_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 10968 bytes
SHA-256: 8a94568272470d99b7433c78374d3b15dad64d341e41b3cbfe91316d2db5560e
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 17476 bytes
SHA-256: e2e4738552eb0d64e83231afebaabd55d5d471ffc6280ced736b8c772c0a737f
font_02_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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