Malicious PDF — malware analysis report

Static analysis result for SHA-256 350af668b3261b0a…

MALICIOUS

PDF

91.7 KB Created: 2021-07-03 06:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8d25dd06f7b5dd7e9167318fcb12d70 SHA-1: beea693f45236577c67cb24abaee61b59be79f11 SHA-256: 350af668b3261b0abfdd0b108a6355695dff4a7bf62a0708b48fd80008846693
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the structure and heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dyglas.com/userData/board/file/23923670678.pdf
    • http://comlark.ru/userfiles/files/40360680941.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ee4b0b29---jamezil.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63a34815a3---87778390687.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/36f2f201652916c7150a30a3902adcad/7547432212.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7a78df8b---ziwepifososipuwewe.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1613ebed---busozawisopiro.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6b76341095c37384e093beaa0d07e30d/19897282528.pdf
    • http://ciskmv.com/css/file/pejamujirotebovopezebaza.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c9b7ccd71056ecd4275af9b176e490ff/korutepefaja.pdf
    • https://hashtag.school/userfiles/file/tawefugeduwu.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca307d7717---83392719393.pdf
    • http://straub-online.ch/userfiles/files/99152947636.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5611ba4eb089c8d460ac63f04ba9423c/56007091241.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/272113e3a1917d0e09df36e1a6744750/pomikesinozakilovuvebov.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/bffc508b7b805864c91446e682ddcd1a/setaxenepewuxus.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2cddbd32838792d08c9741cd0c644765/gosodimisikudejuz.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vrd2e7ccb3ssfqi258lf90bfi7/58386883052.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/jpe7al94sb2i49fsgtco3psn1u/futezubabi.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2e7861ed---79621295112.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a2b32f67---47564486721.pdf
    • http://denki-shonan.com/uploadsfile/dojig.pdf
    • http://enjoy.sk/editor_uploads/system/files/78460643541.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3117016778ca3590a0e3cc7c138ef4d8/migagigujasajegezaluwus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=procreate+letter+stamps+free
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef44.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 16312 bytes
font_01_sfnt_off0001054b.bin
756192943715595f3ff4c76d85235cb42a5788967f52b24ab6e7b5c34cfdc70a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 16856 bytes
font_02_sfnt_off0001311f.bin
16c4f0f73195dbc131d38cbfa44e0ac955135d5a9d65ef645978903c2e744cbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1311F 10448 bytes
font_03_sfnt_off000148e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148E4 16792 bytes