Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf1238ab1a3480b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 05:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b82c0bcc94f603b9e48faa035a994dd SHA-1: 270f52f27a3417ace6f8a1fa30ef0d155cb71c52 SHA-256: daf1238ab1a3480b0277b396e638ed16dfbc41477fd9d4740dda3c192946a243
156 Risk Score

Malware Insights

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

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 compromised or disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/babusofidakajaperuj.pdf In PDF document text
    • https://lotte-ppta.com/beta/assets/file/22353634678.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607909f2ee0f6---32578820085.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8261c4cd266db52f8166ece08036116/suzilakozexanubuxero.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c743b10fc4---19885223728.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1c111b79f---61684504142.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5haa2ph42flss8h94ignmseoc3/33393727892.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/fepagaxikememibe.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/52422817825.pdfIn PDF document text
    • http://goldmustang.com/files/files/wasatigajose.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/jaxozuzigu.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/wovijameti.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/zisulusikasavepote.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610def718138b---zujimipanesefev.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d328fdc0b54920b6659e6b55663bd4df/35243243615.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210719_9F684DF9B9E46F17.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3da4cb7911---85558656390.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160775df82a019---8882673757.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebab70415a---99136011003.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/jedadunifakozogezavozi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9otsilkjl2rgo18ifqjivrj5t7/foxekivokejebizajinibam.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/48e0a0b317f7b59a73d1e6d8b791e1e0/89831937396.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dfa6c7304e3f165a38a666e63d541e9e/31025124132.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/piderelidazozexugem.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210728000214462973.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/joxorejobenovunasal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pepperoni+pizza+paphosPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 10264 bytes
SHA-256: 9e5111d113e28f7e802940e332a8bee5206d6fccccc12ec2001070792e84ad24
font_02_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 17784 bytes
SHA-256: 36acfb6e16bf6e3efc314e09006dbe75c3d1f65d94369fcfffaddb92c3a95b40

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