Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c00046bbe06fcc…

MALICIOUS

PDF

89.1 KB Created: 2021-08-07 22:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b929dfe59629b4d8b0bbc1fb83cfc8a SHA-1: 9344c3695b99ffb013b1108da1011bdb58cf9b7e SHA-256: f4c00046bbe06fcc2071c3aab9ed64ff3f2579f13ee9e9f1f16c9460674533da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://zdravi-kromeriz.cz/files/file/gofoxutote.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608604e45b155---maluval.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/varisosubibaluzufexejogi.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/tekevevageka.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4543dea4---tonozitoguwakinesorenu.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/a951fb1a0eec6dd08cc173eba138f310/tuvidepabevibavodel.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/josav.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ddc435538d0745f4c8c57b5b1842484a/jegenukonejararopipef.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/sfeq2pduo6c1mn6bc52sgpcaa6/22380818156.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a7493c676---20017018233.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0e85b27838c5d279b2836ca82ef0570d/52778688638.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/55842926506.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb37041671---53980173189.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/tetipomudepog.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/eigk6vslsfo52pdrh1fvjm0tkv/84995770204.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/63090981003.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d98b752846b---36856704084.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210612105630.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6846d9c3a7---38356500477.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c790c5c604---rixijulaluxuku.pdfIn PDF document text
    • http://klefmarken.se/upload/file/96654568936.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/bejopofaketawimexelu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c5906210c---xafozuxudobe.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b7345cca---72532552743.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160abe75bf27be---7377704043.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/63814071073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pixel+car+racer+engine+mod+apkPDF 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_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 21708 bytes
SHA-256: 7110655ed1fbad73bf062528f9e8204fe4b9828835492ec50359f481391bc8d3
font_01_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 10784 bytes
SHA-256: 0bedcb0af0eed662d229e79adc98f2a81fa7a6dc622e190b96cc2b2c21c0b6ae

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