Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b01113087d06b3e…

MALICIOUS

PDF

108.9 KB Created: 2021-06-29 21:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2fa0eb130576bc8b383dccff0c58eb0 SHA-1: 6899dddbc3a09d978f87fa060b035ee8ed22adcb SHA-256: 0b01113087d06b3e34392bc7815dc4cd52ccd3a26e0b87f2851c56ad41abfebf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/i2ri8rpbrid8duhduuj71ss0e1/jufawesovuposaduvok.pdf
    • http://aftckwt.com/uploads/file/17783630667.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b0bcd513---8567746899.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/getoxareligarolewewovapum.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/fbaec8ee056a41922a7878906ee1b0e9/nomatilet.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jutf9iq9psf0elu5e9gb3s5e74/kipizisi.pdf
    • http://dafangtour.com/fckeditor/userimages/file/bumizoketibomugosu.pdf
    • http://myphammonly.com/luutru/files/sijiwibugagu.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a12158ad90e---84580961909.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/d1nep45sjalkhoj10ouo0oc7c0/84934036735.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc91f33436---kasurubojelinakoputadumu.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/910e754be781c352ed5cc1f03a29ba0a/87135739711.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/ronatafipogifezez.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rqcf2qpose2r5242id6jg7km4t/20809538860.pdf
    • https://capitalsyndic.com/userfiles/file/78791112172.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/a05cbpul481kmjlqedoj9oncp3/jubosebis.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52b171506f---94137538731.pdf
    • http://jatyn.cn/upfiles/202105/file/1621886090.pdf
    • https://tenfci.org/userfiles/file/65369959392.pdf
    • http://bakoca.hu/files/file/28752942131.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/68c69815f515ae52dff1a2b792d00068/tizodokarizotebozexigerom.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6794278c9---38637404465.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ada91a44eff---forupobasoxisivikuru.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/717463693b8827af461cd8e1020defdb/91452670195.pdf
    • http://www.rotudavid.com/ckfinder/userfiles/files/82850154324.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=3+types+of+thinking
    • 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_off00014706.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14706 16792 bytes
font_01_sfnt_off00015f18.bin
603a73addbe69cd3404b010ead481cf4dc7abf04c5b085d1d165c73d451df6a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F18 17876 bytes
font_02_sfnt_off00018e30.bin
2c4a26b0ab90cf499a2883a7ffb2a9934132db0833d7f70f06f57e5954085f12
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E30 10608 bytes