Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab17a9c080daa86…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 11:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a6ec918202e36b5d4bf36d9ce2268a6e SHA-1: b0116177c1773e89fd9eae4641a43a80dc45937e SHA-256: 7ab17a9c080daa8643754773eecc58e971e64d9365d0c2bef610efc0722c2976
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The primary goal appears to be redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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://novamakine.com/upload/ckfinder/files/kegodosewuzo.pdf In PDF document text
    • http://scbczy.cn/up_files/file/20210912_062917.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/zerewerozizebikesujawexol.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/fimubavemode.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a4aac3573---79810534612.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135135e2633b---42112812320.pdfIn PDF document text
    • http://henca.com/files/details/file/55649760578.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/75163406601.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/15215321616.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/51298619411.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/173463927561344d813acd5.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/79647030644.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///94205345694.pdfIn PDF document text
    • http://vaithun.net/upload/files/85129367563.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/depuzozosufuvide.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/af2f7759ac6f84862671423991c336a7/pufujuzada.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/78096372926.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/lofifuzerig.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/70621920209.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401b20e6dae---gusawulesarutasu.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/mefubudogilugezidazu.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/96131628020.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/15024848092.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/89236913729.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/8845020783.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/78393321107.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/tinusoluruzazoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=is+99+a+prime+number+or+a+composite+numberPDF 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://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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 10848 bytes
SHA-256: 6920e89b2c6c73bf8583a97ed1db8ab9babfe2305f3f7899adbe377f17a91d71
font_01_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 18220 bytes
SHA-256: 5168418c346dc1a570c0809547365c383148f2843459bc1b857866d82cbbabab
font_02_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1