Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3486a203af5afc2…

MALICIOUS

PDF

81.1 KB Created: 2021-08-23 16:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c52bd9e4f216af13fbfe6c8ca0ba630 SHA-1: d6fbf10eb122d38844f7899d8617594740a64d96 SHA-256: e3486a203af5afc2a5b7091529843f799e4e006621aa32cae0d039541df547b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and potentially malicious files, indicating it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://rieker-consulting.eu/files/file/nesotibarulaleripi.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ee4d01b5ceab89305c2c3600a5448cfa/lovozuxadanuramoludanafi.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8abcc0c58---fidebotibilonimodov.pdf
    • http://tao-ssct.org/data/upload/file/38349818543.pdf
    • http://ingenermarket.ru/userfiles/27235818463.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e3d94329---26996846274.pdf
    • https://doxity.ro/ckfinder/userfiles/files/95774522365.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/545d23a14ac3bcd87c020cf1e13f8557/weremoluj.pdf
    • http://mentaplywood.com/images_upload/files/51929185951.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5acab5ac1413d19558f360595ce9616b/5319021690.pdf
    • https://divinenine.net/userfiles/file/bexikofulepab.pdf
    • http://gostinica-domodedovo.ru/files/vagidowinevekawene.pdf
    • http://sanders-scottfamily.com/clients/26926/File/gawuza.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0037f41e3---14351867985.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bb44d622e00f28595115f4e23a48e656/rolamarosidazemujowo.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86b42dc74---6573547604.pdf
    • https://heyratacademy.ir/file/todibojuzipuzepadizajoka.pdf
    • http://phayaotechno.com/UserFiles/File/duvupexupojepa.pdf
    • http://sinproval.it/userfiles/files/31818723543.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607185a51eed9---947577521.pdf
    • https://grup-insaat.com/userfiles/file/6771999633.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160849640726a3---zuluwazokepadanetominuz.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3fa5d07a766315b215198945a4187a40/95713898823.pdf
    • https://argumentua.com/i/file/39878168969.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a61f324cc79---97251639050.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=why+is+formative+assessment+also+known+as+assessment+for+learning
    • 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_off0000bcfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFA 16792 bytes
font_01_sfnt_off0000d511.bin
8e7b8605e496e1efd0443ad827b17c4aca5c2515c916f4216956e3efc63ee969
pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 11012 bytes
font_02_sfnt_off0000ee99.bin
cf9a4a0abfa5d561541a18622b60e19c24df83aec2c1c6dd2196367a11727e68
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 15288 bytes
font_03_sfnt_off0001156d.bin
056e754c92a5f84468e980aac099d70798a55d0420e59a8e8e98172eebeb4eb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 18704 bytes