Malicious PDF — malware analysis report

Static analysis result for SHA-256 397e33e67d7b5954…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 20:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee79586caa8c06101700e140f65298c2 SHA-1: a6b9adff268adc32c642602a52bfc93666dc7e21 SHA-256: 397e33e67d7b5954eb2492cc4d884a5113d8baa8c14c8e08d2fd425c6931238b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with the characteristics of a malicious document used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://krisoc.ru/uplcv?utm_term=neato+d6+manual PDF link annotation
    • http://fipjp.com/userfiles/file/15114815111.pdfIn PDF document text
    • https://kawanmto.net/contents//files/lotibafuzotozitaze.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/82896318568.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c03857a09---xafuwo.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/10066897628.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606f346ee39f4---42186761732.pdfIn PDF document text
    • https://sealskinz.ru/files/file/wibilatefatajiwazak.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/26631795530.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/jilufopevatotopa.pdfIn PDF document text
    • http://amandamaitland.com/images/file/36827271574.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5lch1doiafp5tj6tim2scm8eh0/fesasevanitasazama.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/87987796716.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ejk62dhpnpp23ieguv5c0plevi/tupadew.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6b3c897d---momoziw.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a0df1de2e---fefudewelufopu.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/bipavuni.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tedeloxusezoxuxemalube.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/70987224200.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/63446175613.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160922cef0ef44---61001286757.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d4187ce50---16154411360.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///xixosolizorisisex.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/fojisetigofomiwa.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/48962471697.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/50349395315.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/luxapigovunimo.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/53468251927.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_off0000bef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF4 10292 bytes
SHA-256: fc67b063845350068e72351f622cdcccf4ba141e3593b1f89fd0672129520d56
font_01_sfnt_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 17208 bytes
SHA-256: 71337076cada868277f08a3bd435550dc8f7f2123ed842ad25f1fa02d7ec359d
font_02_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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