Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d20092dd2aa474c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 01:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d8a842986f613eb8246a935afcdda12 SHA-1: b4203d2a87288990755903e2ab4a470aaace3642 SHA-256: 8d20092dd2aa474cd7657fc7949e057bae47acc209be6ed77c2e7ee6ec4d4ddd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wittnebel.dk/file/97260433446.pdf
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/tasibo.pdf
    • https://portalkucharski.pl/app/webroot/media/files/45016166232.pdf
    • https://cordovajewelry.com/images/file/4206264081.pdf
    • http://studiotecnicofrisoli.com/userfiles/files/filulutem.pdf
    • http://zae.me/datafiles/file/susefusofaf.pdf
    • http://tbeaindia.com/userfiles/file/rabunofalewufo.pdf
    • http://topoint.cc/userfiles/fckFile/20210908053436.pdf
    • http://posicert.com/upload_fck/file/2021-9-4/20210904035037124797.pdf
    • http://melly-incendie.fr/img_db/1214677970.pdf
    • http://inistor.com/ufiles/files/60162679588.pdf
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/rexola.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b4d2d59e1---21512929206.pdf
    • https://aarushimukhwas.idealviews.com/userfiles/files/86292812097.pdf
    • https://ibshospitals.com/userfiles/file/puxag.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161304eca643cc---27831718787.pdf
    • http://selfmadefilms.nl/userfiles/files/jezusavononiv.pdf
    • http://yuanyoujie.vip/userfiles/file/41597905377.pdf
    • http://akcjonariusz.com/UserFiles/file/lukanuwijoxinoji.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/85267897557.pdf
    • http://tandartsindex.nl/images/uploads/masaxovanutegedij.pdf
    • http://giaydantuongphongngudep.com/images/news/file/97633622535.pdf
    • https://myparrotfood.com/user_files/files/lijubunuge.pdf
    • https://tennis-samara.ru/img/file/50077707517.pdf
    • https://visualmotion.nl/uploads/file/gubefudavifini.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88f1077d7---13832911795.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=room+rampage+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_off0000da9c.bin
7096f4aeb207607d64374fe1ce65c4bf3ed6efab9d74085502e03d85f698be96
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 10224 bytes
font_01_sfnt_off0000f18b.bin
ed3114a75d301b4f723c3708e5e3669065dd62ba1d0f0b67753ffc78bf4c1132
pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 18440 bytes
font_02_sfnt_off000121bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 16792 bytes