Malicious PDF — malware analysis report

Static analysis result for SHA-256 402325fdb278ae6f…

MALICIOUS

PDF

86.5 KB Created: 2021-08-26 21:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b3cd326c8fdf37e32477f6005940d42 SHA-1: 3ab00be2fe27c2734e09737122bf8a55d399168e SHA-256: 402325fdb278ae6fe207bab9136662fac103e60681c8599e29fd9fe8a1480fba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites. These links likely lead to further malicious content or phishing pages, facilitating the distribution of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://wagaskar.com/media/53916769965.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790f6cd8acf---lifutabife.pdf
    • http://thekitchendesignstudio.org/uploads/files/pedowutofepadus.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/96508453556.pdf
    • https://lacaune.hu/userfiles/file/zapogofiritexurun.pdf
    • https://linhquan-group.com/upload/ck/files/89910489836.pdf
    • https://pharmawell.eu/ckfinder/userfiles/files/ziwedig.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef42cccb14---rowiwanubirerixularo.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608961b3c4d05---nawipadabir.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/28301284242.pdf
    • https://www.rougeindigo.com/ckfinder/userfiles/files/rabekanovemekezujevoje.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6d8c15fb6---84454565885.pdf
    • http://accronline.com/userfiles/file/96868325593.pdf
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/62980782328.pdf
    • http://marcus-1.com/FileData/ckfinder/files/20210614_FCB679E5ACFFFD83.pdf
    • http://adaviestransportltd.com/userfiles/file/refumabepodo.pdf
    • http://hoteldanang.com/uploads/images/files/19023704774.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4c5dce437---fogosuravuj.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/fc68f91212c6a1e8133f3d42eb9df8b7/76737328567.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ccb8db9b4---99713297979.pdf
    • http://studiodugnani.it/userfiles/files/komizod.pdf
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/bilevuruzenewoxomaposukuv.pdf
    • http://naturalmis.com/userfiles/file/nelezuvarob.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073713a05f09---tuwubazepiba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=erythroid+progenitor+cells
    • 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_off0000eeb0.bin
6dc5d0c7082548015174b28325e15a4312559aac6fb2f5984079f58663d06828
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 10728 bytes
font_01_sfnt_off00010705.bin
e188dd2ad4304a8c43ec33ac6057fbad5d770070f40cca579d6e6e31bb464823
pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 17200 bytes
font_02_sfnt_off00013385.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13385 16792 bytes