Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e82666064d5bfe…

MALICIOUS

PDF

94.8 KB Created: 2021-07-02 17:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad2eeb8241983b3b4e349488edb38f7d SHA-1: 3e3818cd03ee81f845027eabadbee5b0a89f9b21 SHA-256: d8e82666064d5bfe80fb4998109282e896dc7d25f09b802eb4f56a811665a50d
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. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of these links strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/15cf2d5890c767c4d1d21f25cd792e89/80123940940.pdf
    • https://aslimitada.com/userfiles/file/61256406312.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9124072a---85419521763.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9919e6995---juteboxijonavesewe.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf95dc547---75104621732.pdf
    • http://leebyunghun.kr/new/upload/board/files/85091780084.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/50398d5968a1c8daec5bcb2333813cae/zugezajalojaviwe.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3c4bcace0b546075fafd424aecf79c57/zivojipodiludevomesax.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hv9n3pnp6epi3vm717vffe7kk7/34539700238.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/3603026147.pdf
    • http://myconnect-thailand.com/image/upload/File/77208261347.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/385b2b724078ae2d51508dfc9efdb74c/setirotenorukutobot.pdf
    • http://nordicaluminium.ru/userfiles/file/19361430554.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3prd445v8hpm7lqgh7juaje972/lavitipitejezafofupuloje.pdf
    • http://le383.com/uploads/files/41808251067.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b84b10beac5---79425418530.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/20d4ecdfcd0b7d8a74c6c987cb0e770e/zedamawowonozi.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f4c8618f1cfbd8f6d64756d6b3af138c/lutawaxod.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ede6dfa193799972cd115ecfd99053e6/30175266293.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/befitunuvivo.pdf
    • http://kiavysocina.cz/UserFiles/File/mipemibijalusi.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/tugokileg.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2b7503bcab3f47a0fcf3c1caa9dff58c/97340706504.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=common+interview+questions+and+answers+for+freshers+pdf
    • 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_off00010d4c.bin
07c0db4b6bed3c01651c0547f12fa7b9366ce9f0d9c2a019039945cac9d8716a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 11148 bytes
font_01_sfnt_off00012707.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 16792 bytes
font_02_sfnt_off00013f19.bin
fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F19 17792 bytes