Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a303723ddfff00…

MALICIOUS

PDF

83.8 KB Created: 2021-07-03 05:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9555fdb405c3e5fbb90667331a1a192 SHA-1: 4e5dddf50994dc509d54e3b9d633c2ce862fdd2e SHA-256: 11a303723ddfff00571e92df12d7278840177ac78d9465ae1efd443f752e5fb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, 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 via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://anfauglir.com/images/file/12951648832.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f197ba4078---56928923290.pdf
    • http://malagi.pl/user-files/fck/file/xaposukokatowafen.pdf
    • https://retta-bg.com/userfiles/zivarevezibejim.pdf
    • http://massageindex.nl/images/uploads/rofobosipiraxero.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a169fbe8ff2---81888788935.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f26f34c7e5---kejavuxozejusogub.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a60cfbe723d---nivuzuludesekiduses.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rh2ddr05e33n2313a6f20tlc6i/85470931080.pdf
    • https://dannysacademy.com/ckfinder/userfiles/files/kamujisumujif.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d222c0d6bc2bf3e0ba70762492c09c18/vuxabesosi.pdf
    • http://wahluenfty.com/userfiles/xekasovumiwiparuwedinukex.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb88ad152c---mutonun.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7e4aae12558c772f64ebadb4c55ea0f9/fiwagu.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04b48d66a---14246282131.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e448805abebbd53befd003620c19e89b/bularegunujewojupa.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e8d601ea---5590437808.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/g2hooeh7bmovfg00q077iqvm7j/mozefugo.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc8487776c---rowigonusukulep.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/86a8ab6462e5782d449be88d44259618/89130603293.pdf
    • https://dcimx.com/files/pojugifilera.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083994490a3d---72559119230.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc926b40c---foveroj.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/2de5affea1aa02b0e3af80acfa8d90fb/xetojagajabop.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5ljoaq6lknoukbf70sqmn60ph4/lanurogumemuvef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=everything+i+do+hits+the+roof
    • 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_off0000e3e1.bin
a6b9b1dddb7f325d056f81aacda3b4b4f8f3700f5dee0d4ed9123a6fd439e3b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 10588 bytes
font_01_sfnt_off0000fbcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 16792 bytes
font_02_sfnt_off000113df.bin
12ede4827d55d36b3068285bf6286075e06e409258d948370f6ef05b3658401b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 17540 bytes

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