Malicious PDF — malware analysis report

Static analysis result for SHA-256 6794ec922a0c92da…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 16:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b0e5a39482da9adaf4cf67620210046 SHA-1: 8f9f517dac8a55fe8b0afc6bbeef46270d28cef2 SHA-256: 6794ec922a0c92daea892288ca4be79632cee829381a67ef22cf302559499278
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest an attempt to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://broadgatecapital.com/userfiles/file/koriwa.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/levabutesivuxeze.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4ej98rq2mal9tuk4v46ofqn7em/36548837720.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd9b0ea18a---tujuwuduvakad.pdf
    • http://curry-box-deluxe.de/userfiles/file/wakegofoduzumas.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1669d8bf---70968900749.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794370161d3---83472817196.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a6ac7913f2c001d63409fc2097752619/14216298525.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/34779216254.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c17b70cc902769d3909d48061de2e40c/xiwusudegesoselob.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef1a57aa1---28254003208.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083e378aa48d---51790392330.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/57179d61dadd480521dafc71c228ca1b/fuwerudozikogadawalo.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e2c5b62a9---50240008274.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a7e7e11a8aafc0917557e62b1eb71df3/91098116575.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d53ac47ed---rosofadejuz.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcf85e53eb---xidawemew.pdf
    • https://pbchistoryonline.org/uploads/file/2714548747.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac7c089b48---57014054707.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b31d004587f2e01e4465c4b41615fb65/69132540822.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ipr35jsvcd5on3mvh2aj27n7s4/fovox.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/52118822204.pdf
    • https://paklya.su/design/img/upload/file/93030135745.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609432400e166---wuxegura.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=highest+paying+careers+in+business
    • 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_off0000f300.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 16792 bytes
font_01_sfnt_off00010b17.bin
a007522affd43fa5ae500f0cec26d695026f45ab0e2b6946390eddb60ce77897
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 10832 bytes
font_02_sfnt_off000123d2.bin
58f25dfbb9ccb54898b33b57c782163e0237636674adb99b26f2cac145db4076
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 17976 bytes