Malicious PDF — malware analysis report

Static analysis result for SHA-256 960fe71f7c9f5122…

MALICIOUS

PDF

82.9 KB Created: 2021-07-23 15:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8a1b5a8b01940ea9260496eb1868b77 SHA-1: e7e860c506cb49010c89a14b1562b5d1efe71c1e SHA-256: 960fe71f7c9f5122a3d50edb4aac63f6d8566006028cfacb6332d4a380f5c102
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links on potentially compromised or disposable domains. These links likely lead to further malicious content or phishing pages, aiming to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b0a084bdf---fixonuruvogod.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8euetngkarkt2q8jfsv4ai05l7/33949630188.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982dde6b9a7---42720829280.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/tebulexalividaf.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e3851b61e---6186965591.pdf
    • http://bjallstar.com/upload/file/51506190004.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2bbcb9ef---kimukemujolobidofavofu.pdf
    • http://orrizon.ru/images/file/56947435574.pdf
    • http://ipmarketing.net/userfiles/file/dokomijipejokezazeve.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/59922829357.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d7cb99a44d2fbbfbd34afb4b638df659/kimadevizedafisivuzulefev.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/jukoremizeper.pdf
    • http://wwpokebar.com/uploads/files/56682787393.pdf
    • https://myvideoclasses.com/ci/userfiles/files/47010487924.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae6ad4b3c---48887638136.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b600fbe1688---24807008394.pdf
    • https://verandapattaya.com/userfiles/files/44649395421.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eadb0dfd91---12638166283.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/vcj6re9vdsogkf8iu2hatdlm99/fovimavemo.pdf
    • http://progfin.pl/userfiles/file/medini.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/16947989176.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8558b090be---molikolegipuxarizijeret.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607029e7c4ab3---35291051067.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cebolla+morada+valor+nutricional
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def3.bin
5bc28e4d66060d55357f72ee9d489146b93eaad35403516aa0e23e76fae8dd46
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 10700 bytes
font_01_sfnt_off0000f77c.bin
6593c87c524e49e8b7cfe2ec96c720d1e0efdc2a102fab11625167f87913a5ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 18512 bytes
font_02_sfnt_off0001267a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 16792 bytes