Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fd6d91def1eab3…

MALICIOUS

PDF

158.4 KB Created: 2021-07-07 14:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 6e3718f925de72de3d3275204b7e4960 SHA-1: 1ed9e0d2b67e0ac8f737d8eca2f40550805ec789 SHA-256: 68fd6d91def1eab39024ba65a12654e086636e88e5c6163ff3b4bb271dc27d37
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://crewmak.ru/uplcv?utm_term=places+for+tune+up+near+me PDF link annotation
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bbc02459451cdc08e36327905639319a/41736739451.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/45373607648.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/12432e42903c6f2a7afa8dfe34b969ab/78477638028.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/90944107192.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tb4dpeg057d7lho2q1eftsbq06/3768210743.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/najen.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/7789292615.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ta6up1s8a4pfheg8mc98j5dlig/radatijenikugokivakokan.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/3bqig0gecv0ltd4vtd29fptpg4/28813036476.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/dajamaweganifufekafapupo.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1624853426.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090405b98a0d---84253266998.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jggo0mnvbbmm4i1ia7478e0qcn/dawesuvasisorusar.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/42059500744.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/7714246773.pdfIn PDF document text
    • http://jkohut.pl/file/nimag.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4b389eae52da17095358a229c6e38a99/74706304403.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/mawixaxug.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/wajifero.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607735386b8f1---ludekesimo.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zusazonejurefuzup.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jadefenamuzesatofib.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/57290641758.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaluvofijifatetogujodulu.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_off00020661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20661 20160 bytes
SHA-256: c82d9c97b9fa1da87cd0c2cddcc645b6e668d872d2983acc3bd76d1f99ab2482
font_01_sfnt_off00023b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25349 10652 bytes
SHA-256: 9dbff2354e7e5935a2d5b700c3985c95c7d3fa0782b9338c9e50a38683d1178c