Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b422874e7481497…

MALICIOUS

PDF

94.2 KB Created: 2021-06-29 05:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 273551b3a25adec782a8a0fab57e2cae SHA-1: 257606a9abab7679a5fd7dc3ed59271065586fbc SHA-256: 8b422874e7481497545d02b55fb001b6cfc3f5593775761c2e5f40bb8a86b267
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://thuephotocopytaihanoi.com/upload/files/37294567226.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a720b9001fb---30301869894.pdf
    • http://files.ibiza-ferien.de/file/bumupawazirisal.pdf
    • http://files.ibiza-ferien.de/file/bitumojaledegukojekibetis.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160885ed511040---70674639314.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a68457771300dbd0f5ad86c5d6da343b/tugojamalapuwirame.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c46c4f993b84d2c80aaf3ee5823c4e68/64834844709.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd01bd1ed8---baragutawubebu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1511b76ef5219f00f86dc77341a62345/tijoderipivowamef.pdf
    • http://ya-ke.cn/admin/upload/guxap.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8db10cec1---92396453781.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092bdeb2b3bc---gokazenumixazotumimegipok.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/92120872820.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/r6ti0tm5ectfvr35tmfkjriiu9/pumobavu.pdf
    • http://usaoxin.com/userfiles/2021-5/file/31579101433.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/85297816307.pdf
    • https://acgroupenterprise.com/userfiles/file/75098943357.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a0d10f47---91528989546.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/33862420254.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/ee71dd5aaed1ab3f7210b6ea8fe08b17/lukunagukesatilusewo.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a54af84a66aeec64738f6c696c390096/68842849563.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e993acc50---39269680312.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb90fe27c9---6410072711.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d88f27bf47b92acf7ff04e7e2f5e9273/39534878802.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/dunewi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=scary+meaning+in+marathi
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f631.bin
14c0a30357dd1bdac9f275dfc012c8b82ad604d151d92c9c3d9992117d1ef033
pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 18900 bytes
font_01_sfnt_off000125f6.bin
ece893a914e7b5084884842bb56bb06a270a95e8aa1aab23b775ef9d5a263eba
pdf-font-stream PDF embedded font (sfnt) at offset 0x125F6 10532 bytes
font_02_sfnt_off00013dd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD2 16792 bytes
font_03_sfnt_off000155e3.bin
313b4d1b1f982e25284d2f4e6caf7c0c7767db1f375da95b613bc7d89e59efd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x155E3 16064 bytes