Malicious PDF — malware analysis report

Static analysis result for SHA-256 560d666aa751c109…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 12:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88d5907c4d968174a9ec65a323878fe9 SHA-1: f22199de4d43625866d3aa7f965391865ce1253c SHA-256: 560d666aa751c109c5b76047ac81c18fd070cacd4b97ddc7c53f4d99bb00a8c3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the overall detection suggest the PDF is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://garglob.ru/uplcv?utm_term=transfer+pdf+to+word+document+for+free PDF link annotation
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/j1j20n56p0amsi738orvmvr1e1/18627789338.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/97211389962.pdfIn PDF document text
    • http://www.polni.si/Images/files/rufebafupikud.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd0b57fb14---94284006317.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b2dfe8aee---93692638225.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/wuziviruwamixafobano.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/86262386348.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39941753162.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/82608042591.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/51969503739.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/79376624081.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/tatanirolelid.pdfIn PDF document text
    • http://web68s.com/upload/files/nowav.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/59184362288.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/zajulimevo.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0e60ba4f08dc8af03a5618ee0793a28a/47199114590.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608512be9de25---kuzaxoxudafovakibuwurisem.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f273070f8df---45503648227.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06ab1116a---22292042732.pdfIn PDF document text
    • http://webursitet.org/Files/file/tizinetelojigibimilin.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8fef723a5d9e3f9abcbff7738d763853/pomefibenasexenozovogom.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/12993120040.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/11772101994.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160817b3b663c3---zosagewokugidor.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q322etsorcd94tmodvq54vuud5/17862510052.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bce6ad96e51---pupadoge.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/77959189991.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_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 17660 bytes
SHA-256: 371aafafdb3a3ac767c37279aff42ea30c0d76750e657ec95c040d6f2b18ad39
font_02_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 10792 bytes
SHA-256: 8f93b0882889f32a8833a35735ac693ac8c4a7086236e57aaf69eceb04d0f289

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