Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4edd1a28c30b260…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 13:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14efeb117b84c94ee600ed59424a3b48 SHA-1: 2729dea7cdf2a0209bc85053dca1581cf3aeb2bb SHA-256: a4edd1a28c30b260da704d17a30e0f95601fba40dc61cfb88b8b39fdb556b4f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cylinder96.ru/admin/ckfinder/userfiles/files/vutofumudu.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/kudutukekon.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161382709584a1---xusajepowomeragub.pdf
    • http://allineers.morefriendship.com/upload/files/muzej.pdf
    • https://fetogram.ir/images/upload/files/43265822502.pdf
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/remisedameravogujeb.pdf
    • https://moiatakashta.com/userfiles/file/80395616967.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d36a4b3b9eb099360d09371291c372bc/51660421998.pdf
    • http://gorod-r.com/userfiles/file/1498554830.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/goziworukafuje.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6392195f4e91ab7079227f71ff697754/dakesaxa.pdf
    • https://buonoantonio.it/userfiles/file/70184358125.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a13ce63fd---dipixaterurufawak.pdf
    • http://stihoplet.by/upload/editor/files/72560068133.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/dc21ca302f0fdd7b8f76465c5541e1ae/danojibolimoguluvum.pdf
    • http://cuacuonnhaxuongbinhduong.com/upload/files/rojudilike.pdf
    • http://gardena.crazyrockinsushi.com/uploads/files/71084482449.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/poxivojilur.pdf
    • http://strategie-online.net/catalogue_dynamique/file/83699712666.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be46e4f073---42987258521.pdf
    • https://globalathena.com/ckfinder/userfiles/files/72241643667.pdf
    • http://jinanxintiandi.com/userfiles/files/43567810777.pdf
    • http://hadt.vn/upload/files/1006149928.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4pegb37foej60siv10f3vkldn6/1807159648.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gangstar+4+game+apk
    • 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_off0000b046.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB046 16792 bytes
font_01_sfnt_off0000c85d.bin
02ce092c5581920ba2cf1a1659a4fd7df91272e94bee099af49bc6f921712cd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 10548 bytes
font_02_sfnt_off0000e079.bin
7c79182e066b1867dee71a559ad0abf543f0e656beef0d790befeda85f1d8c9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 16448 bytes