Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3492a1309eba0a…

MALICIOUS

PDF

93.0 KB Created: 2021-07-06 19:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 477df602796b80950a7b91f46935ad33 SHA-1: befca074a1a51dcf6e8f28feaacf0aabb6cbd8bf SHA-256: 0b3492a1309eba0a66a38db6d7509328aeb5f54ee3d84fbefb01774d104e07d0
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links on disposable or compromised domains, likely to lure victims into clicking malicious URLs. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://airshow-bg.com/file/venoxewe.pdf
    • http://richmediahouse.com/admin/uploads/file/fakofolebudulupulira.pdf
    • http://grandinspirations.com/clients/75274/File/70571399709.pdf
    • http://pnmanagementsolutions.in/uploads/wumowilixeromusuwizef.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb296d6754---mejopepobomuzofudaxu.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kjb5p0mv5gopb0ict1s3sj64k7/dimuliw.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a91d026f2be090c66593827caba84b89/6239642020.pdf
    • https://schmitz.cz/res/file/jituje.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfaf0f075---53585759942.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/383075baa53175bcf06db18535356b5c/xosatimekopamugafokugi.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/seponukulepajoxixowike.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca8c251b2---bosajixin.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9287773566---lebajepugopugop.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16087d89f79743---19379650372.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cucb0asc292dsek827qff0ml18/83979394594.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a284510fd6---rilikifigujuf.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3e5bfa57f1ab8ee07c7daf16b7adfb41/rijoz.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6ddd2e78510fb86fbc303f08663825b7/18707097407.pdf
    • https://ehlibeytalimleri.com/resimler/files/jadevuxe.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fc3c2e2cfb13cda9a304e26646149944/wepujolarojaw.pdf
    • http://citysuji.com/ckfinder/userfiles/files/38584285602.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/8e971131ca84c0365aa27df2e874cb73/pagakozopapejo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=astronomers+build+optical+telescopes+on+tops+of+mountains+because
    • 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_off000107ff.bin
9d05ccea513040596402537bf3720ed59bd17b440712570a4c9a0b63553b7f7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 11000 bytes
font_01_sfnt_off00012157.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 16792 bytes
font_02_sfnt_off00013969.bin
0bb4efc9ab39c528c523c350d042f151ef935e16bcf8827f4e142fe0d76d49d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13969 17120 bytes