Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b6229f6274f922…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 03:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4ba190cb996e184d0b0fa6ad088940a SHA-1: 046f6e18f9cffc3e2f2d3bb898d8bb5ea044990e SHA-256: 80b6229f6274f92238c394653098f30660fc99786cfbadd502897f632ac8b6bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the document acting as a link farm, directing users to various external PDF files hosted on potentially compromised or disposable domains. The presence of embedded URLs and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://lagostena.it/userfiles/files/mekepomafuwapanazutapure.pdf
    • https://gites-les-bardots.com/userfiles/file/vamilonefikopasufaxe.pdf
    • https://penzion-palice.cz/content/viwobavidabivexonari.pdf
    • http://yhbinternational.com/userfiles/file/65427996867.pdf
    • https://martas.vodrsport.cz/uploads/files/xezal.pdf
    • http://hiddenforrest.net/clients/76790/File/piwonisumojew.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/88439238730.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7a39daf90---14734674202.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/iv69rmf9j1mdc499q9p5p9pmb7/56093466556.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/58979a6ba529482f9599f677dc4438e2/sofawaluxuximoluzag.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2087eeee4c159358745a927467015594/dikusubojararegibotuxagip.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/48342702da6a97f452e3c220fce46f4c/27261415482.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ae82d8f0c2095ecc0997be0c41a5d8db/razusarazobibaz.pdf
    • http://j-line.ca/fck_upload/file/1193437995.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160821dcae4b1f---pokufazotuvusus.pdf
    • https://searchlink.org/userfiles//file/bateruzipajazupozo.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/188eed3de1540a6123c5fda1e63c0116/goregajaxefumojalowevi.pdf
    • http://cappellastudio.it/userfiles/files/11862244064.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/dd5ac5edb147038113aa371f5b015097/66085379536.pdf
    • http://solamsys.com/userData/board/file/20323084947.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/e1a4hkq4opi6q807gqkfjrsq9v/wajumagimaza.pdf
    • http://anabakorea.jp/userfiles/file/dezogutuwunexanurigu.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3fed048bff814f27f7737d8713477e1a/1892687014.pdf
    • http://shadesvalleymounties1969.com/clients/868959/File/furixo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cordova+plugin+create+pdf
    • 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_off0000cb37.bin
e5e17b48e014821d613198e9578bfff8e8146231d6dd0d3443ad6bb6c047bc23
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 17760 bytes
font_01_sfnt_off0000f95c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 16792 bytes
font_02_sfnt_off00011173.bin
4c24f3be857aeb58a8b5e258dd8147774b84d49706f8ca7c4d5e5c595998dc63
pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 10824 bytes