Malicious PDF — malware analysis report

Static analysis result for SHA-256 925cf3b8a8f3081d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 23:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f33b79069fa1db85bbbd12f5ee544f8 SHA-1: 82826ef4af0c3ace1128801c161ffe27957258c3 SHA-256: 925cf3b8a8f3081d534e8a89ec9def45ff28c3ea28a044f82fbd277e9e46c82b
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 of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f7843b4ef66c3a95f4bddb44a940edc/zabekejiligesu.pdf
    • http://yjsyrj.com/userfiles/file/10660582707.pdf
    • http://immobilieninvestors.eu/userfiles/file/31558477796.pdf
    • http://nmways.com/uploads/fckupload/file/43014155369.pdf
    • https://likeevent.it/writable/public/userfiles/file/99708444881.pdf
    • https://alakharia.com/public_html/userfiles/file/nuwuzizi.pdf
    • http://talentfuturesservices.com/sharpinstitute/images/files/pilalupipudugigawazinizu.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/crv4s1ok12qdcqi9mmbksusoi4/49326228630.pdf
    • http://wonderpanel.com/app/webroot/img/file/74067458534.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c21d307ce---306938824.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7u8c2l5hnrmkafu6m5vd945lj3/58867940297.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04576b0f4---kamaziraj.pdf
    • http://backkwang.com/userData/board/file/gejuleja.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe210a6452---59821958926.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/taginiruregopu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104976685957---liwaworezovufegalin.pdf
    • https://haysalon.com/public_html/userfiles/file/3919224761.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/5215708268.pdf
    • https://fanaf.comarticle_ressources/file/mozatenetofad.pdf
    • https://xn--80aaijzh9b.xn--90ae/documents/file/bafazawirazirepafifowobi.pdf
    • https://ost-fogging.com/upload/files/kikutax.pdf
    • http://vvk-wiedermann.at/userfiles/file/lixukisasavirefijoveg.pdf
    • http://gld-lining.com/user_img/files/zabeligimopuwukomoxar.pdf
    • http://morecoredesign.com/images/imageUps/files/tupemuwimevepeja.pdf
    • http://ankamet.com/userfiles/file/vegorovevubaxowiwoxexug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=convert+pdf+to+excel+online+free+without+mail
    • 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_off0000dda1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 16792 bytes
font_01_sfnt_off0000f5b8.bin
efad96185a17e57192fb182b025148e22c5864f3bf95af02a199e0f652503b16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 11100 bytes
font_02_sfnt_off00010f78.bin
2d88e4a1ffbd9341cf568cde85f02bdb5b6d5db7c8d58de487ba3c62e2ab35b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 16668 bytes