Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c740240fbade5d1…

MALICIOUS

PDF

98.9 KB Created: 2021-07-03 20:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d83eeb6723ec59ab963a249f836c2cc SHA-1: 97d5eb5345b2f4777252a8fa02228e2377ba274f SHA-256: 3c740240fbade5d1eb5b45f92e42569bc2728b57aff00fb26122dd5936afdbfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The presence of numerous URLs pointing to various domains, many of which appear to be WordPress sites with form upload plugins, suggests a coordinated effort to distribute malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://infrive.ru/uplcv?utm_term=tinwoo+smart+watch+instructions PDF link annotation
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ebca50ab---sutikuxifovija.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608204a40dad7---50225461965.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8kmgsfnrp46l2e465erhd2d6nr/8286293214.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082846eec301---97963836053.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/qs49978gmel0t987krc15tehu5/sepul.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/79f56e859f857b4e0c3be555e4a7235c/94963164393.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/danodefisogawe.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc44d5644---36952612526.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/93652030806.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6a59ef25---bamakofinit.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5bf0094da2767568e150cb5d565f10ed/komuseki.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/99450411960.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lb0konbm410i5np8v2sur2iuqt/28899708959.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7ecffa66ee5f61aa16920fa72990b44f/welifidulojat.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/94823350758.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/54d91fecfb6db5ecb06dfc744345e1e7/porovebimevepadopajazo.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/63836147011.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/8vb6guo0rrpfnej5oak5ad7j86/2734816379.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d307ca2ce9---kisowajego.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84bacbe21---88696342161.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61ae576e3a---jawafapenonidomejilogep.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/kds544fjgite2b6pmvt1h27545/4372417667.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e6618db3---96175812817.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_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 17688 bytes
SHA-256: 2df96032c46a5edad32fb2c2910953e476effcd83aedd189a78daf356bbd5f6e
font_01_sfnt_off00014d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D03 10464 bytes
SHA-256: c1d9eab545f00be6226e617430a605ae8157bac13049fc6442ba317d4b7f5286
font_02_sfnt_off000164b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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