Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d547894f03fe2d…

MALICIOUS

PDF

87.9 KB Created: 2021-07-25 04:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9b806204684071a911122c3e6d8f741 SHA-1: 9508fede76cb1a4beaf8839157a2d88e0c76f863 SHA-256: a1d547894f03fe2d05b6a89e6a4cb124713605f737d117e3953a1a60f0f9b783
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to potentially compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV and the ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the nature of the heuristics strongly suggest a malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://agriturismolataggiasca.eu/userfiles/files/sesop.pdf
    • http://kirakuramenandsushi.com/uploads/files/savokupakesidilafeme.pdf
    • https://rajaunited.com/contents//files/26446452256.pdf
    • https://bobecoingatlan.com/uploads/editor/file/pimogasusixixameb.pdf
    • https://nonbodepsg.com/uploads/files/37233926464.pdf
    • https://alate.org/admin/fckeditor/editorfile/zofilofisu.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6d4a7da4---fapokarevujujajowa.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/valunatix.pdf
    • http://jan-fotografie.nl/upload/files/wokowefel.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/1sese9v3dihtgs01hhc3ii5vdg/tabip.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609306ff5ebbf---47282459061.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a644fc25fc0---70861368098.pdf
    • http://alemotta.com/resources/original/file/19979072084.pdf
    • http://grandinspirations.com/clients/75274/File/totawewenebi.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961b1a35c23---35199565031.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd3a78304---dofimeke.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/6555297696.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6f807767eac242ffa4aaef095fe91719/nekiwapoxabimara.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0fc81328f394d79d7d5d7bb7eb4c02e4/90771444295.pdf
    • http://asja-doll.ru/userfiles/file/xusunizawidawerebawex.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//navujubimorosejudobefa.pdf
    • http://gibisch.biz/files/files/21901045969.pdf
    • http://antwerp-reefer-tournament.be/argt/files/26831338277.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a7ccc3697367fbd7549842bd1a8714c6/movebasidizetilemazi.pdf
    • http://worthingtonpark101.com/userimages/javoz.pdf
    • https://club-sports.net/uploads/products/files/senafidusejogimepijatad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+printable+music+rhythm+worksheets
    • 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_off0000f3cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16792 bytes
font_01_sfnt_off00010be6.bin
f4bcfdf152197ea3f8aa0203cc42f3c05eb2e238a6692b4b7b7385c9911df03c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 11148 bytes
font_02_sfnt_off00012594.bin
38aac082161ccd5eb7b3c82411f20eb1317fbc62a928d873ac2f64d567b75a58
pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 16560 bytes