Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24f74bb791e7588…

MALICIOUS

PDF

74.7 KB Created: 2021-09-27 21:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cb69dd5be442bd1dbb28ea93dbfe05be SHA-1: 20d726c4f87b79f08ab743521a74aa24f8180b5f SHA-256: f24f74bb791e75883be556c69c690dbdac1c49e438eeba91c91bd4264145170f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to lure users to malicious destinations. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ansatrans.ru/admin/ckfinder/userfiles/files/fekapem.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/m6q96sae34u9393r2b2dbm1thi/dejexugaxilodewos.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/buwejoti.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b689bf3393---67993314864.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/tuzuramijamiworikemukowi.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4db773282c540f9977adf67418c78d70/64620350667.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/dazolumurewezujake.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2acaca0c3---wuxulegavaponogepenuvin.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/12088160461.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/45337607728.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/vewosusikerigomexaxire.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/31688178546.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/73072560729.pdfIn PDF document text
    • http://fygl.net/uploads/file/081429107742.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/86374463795.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/tatiroder.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/mosiwagimejubatuxawezi.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/17260018609.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320fc968c5a---15412167629.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/30764743079.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931c71428c---9591580061.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/3692565071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=i+look+up+toPDF 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_off0000b9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CB 21012 bytes
SHA-256: deb24d3de785d2da8ed098c76e573f6cee6e381dd583e3dcb45338c925cb75fc
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 9628 bytes
SHA-256: 570d398e5cd07865bda29542d8d52efde18c26731defaead023da12a786a96cd
font_02_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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