Malicious PDF — malware analysis report

Static analysis result for SHA-256 830afd0b9e63c27d…

MALICIOUS

PDF

162.8 KB Created: 2021-06-28 03:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 802b4d16930943a75eb244d8f320e675 SHA-1: d7b0111773582cd975ef0b01e28ef1f0ed67fa6c SHA-256: 830afd0b9e63c27d0f4b1dd09877c6441255cb9f5189b228297b1c63fb1bc423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to external resources, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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 http://voxel-avocats.fr/uploads/file/jozutegitov.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/69c9d4e353f59aa5e9aab04e8aaeac94/vulemedo.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3d7c2c193---83744562141.pdf
    • https://adsbudget.net/userfiles/file/54919470726.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a7171c0f988---39820948029.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b7c1da407c3dc7d0d7e2a0c36adfb86/45585698225.pdf
    • http://abwva.com/uploads/files/joxigi.pdf
    • http://hainescentreasia.com/images/file/96212763195.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775edc4adb9---sadiratiz.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d249931399---vivajezavuka.pdf
    • http://interel-rus.ru/test/sites/default/files/file/fikidolobotig.pdf
    • https://isosklo.cz./uploads/gumape.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/vitokiko.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/bc06fcab0aa7778f7fa72b0d9cc70720/11556729786.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba1fec8d2---pokujiwelesikuximasobon.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/l09kchla70ojo32s6rpj406lj1/97375021198.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/mominekewubawimenub.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/zedinagevavigo.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/32dbc732a22dd2ef2c044e3c40093317/posej.pdf
    • http://kcobafl.org/ckfinder/userfiles/files/lunututudipulalo.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f95c2072---60289746934.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/klgevioaa244uev9i3s7h3qo90/95462904903.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/omc5kpqeik80ghq3dkfud6jhrs/rinirifusube.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/570a44cd2a1090bd54929708f383ad3a/zuxumirifibumuno.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=equation+of+continuity+by+euler%27s+method
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ea88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA88 16792 bytes
font_01_sfnt_off0002029a.bin
d3a79b81a0098866ff8d63cdfdb565e96fa2c50d829816dc81ff66f7c995f59e
pdf-font-stream PDF embedded font (sfnt) at offset 0x2029A 22544 bytes
font_02_sfnt_off00023d1f.bin
11f4d9ac4b1a9ba501af010c44fa3c23a49598f87ade31166777e105042f23aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x23D1F 11260 bytes
font_03_sfnt_off00025731.bin
e68897bd50a2ca057e713c122a2a2d34eabf16944ec614df828ba33d2e15c4dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x25731 3988 bytes
font_04_sfnt_off00026666.bin
eec42f0bba4018f6ae412dee0b30f2e8f62d2964327a9edc906b3dc49daea092
pdf-font-stream PDF embedded font (sfnt) at offset 0x26666 16248 bytes