Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9050dbb2169412a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 12:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba723edfb3088b69ddddd47eaaa5c11e SHA-1: 06a297c4b07ce077a198c5d16c5911325bbc873a SHA-256: f9050dbb2169412a233e101e490c1206f287876ab804d05ce4d29cb41c8cd873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely intended to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=church+going+poem+pdf PDF link annotation
    • https://ooo-kenk.ru/userfiles/file/gipopufewimozofesidoje.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/63600648384.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9c2aa4637f794ba0b30bbe482a071cc4/jelerinobusipasuvutiguli.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/fubazebezefam.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/598bcf1c8d711b51fab76f67dcc6140a/66008871045.pdfIn PDF document text
    • http://stonebreaker.at/28857040662.pdfIn PDF document text
    • https://clinicscrm.com/img/files/galevekipubofezum.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/xuvudenavifivojawonaju.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/9e3m3prdn0h2bpogitlckdf8f8/66130500546.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/12f62bab490c44e133d936e9d6a86aac/22594420496.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/dogijasumefuz.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f5529a64---kitubogedelurinimoru.pdfIn PDF document text
    • http://schokobrunnen.com/idata/sexetagejotaj.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zanojidadapox.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/01b7d8e96587e37be97cfbab4cddc5c8/11477050951.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e5388cbbee4---kunofubukejidava.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/c83bb36a7bb0fafa442586a123b9d102/japurina.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210504122113.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/93178886033.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a1e134ae94d00a6096a3640c26459d41/pixawufabe.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6dsh36muv276pih7dnnddnld2/13278160536.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d8d777fd1f32eadaf44a2c9fc0902940/mibelatefilavagodujik.pdfIn PDF document text
    • http://tochuchoinghi.org/files/nugerawekokoresuvusa.pdfIn PDF document text
    • http://yulintimber.cn/d/files/zukomevokuxarudejajad.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_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 17788 bytes
SHA-256: 9ed78aaeb58635301956aae2456de1ae2d4127608408b6eb31e44e07b58dd3c7
font_01_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 10724 bytes
SHA-256: b5299e8676bfef495fa46485b6e22eec27169eeb3e4a76247bf79486337e3819
font_02_sfnt_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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