Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af9180f17c0ca64…

MALICIOUS

PDF

87.9 KB Created: 2021-07-03 23:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01f2f2652150ee947d924d1151ed3399 SHA-1: d96a0333de8dbf8ff8fe5f39a4dc402167cfc7e5 SHA-256: 6af9180f17c0ca6428150c562a669cb82b3289a4a11a4113fe163f8157711307
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload directories and disposable hosting, disguised as a physics book download. This suggests the document is designed to trick users into downloading further malicious content, likely through the embedded URLs.

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 http://yummyschool.com/_UploadFile/Images/file/92732269649.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/4u46uu2mnh00fteps4jonjp004/58887987445.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa5b475a2d---76714110594.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c29e5431ab4---11852778503.pdf
    • http://aliceinformaticasrl.com/user/pages/7095696542.pdf
    • http://szyuangang.com/UserFiles/file///9378310765.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b631ec638ff---14109395541.pdf
    • https://hashtag.school/userfiles/file/juwurowajemuroje.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608168c8cb747---75599020927.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/364b79b7c6851a4b2016081616a5b0f1/faxezaj.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160793c8d5ae3e---lisew.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ee1524626039059a4f7c391a4c518e77/17024604062.pdf
    • https://houstoncoinshow.org/FCKeditor/file/88254644768.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096da88e644f---4059928082.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f0c0647ead4cd682bf2043e66b3610c4/50748461134.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/b2982a7cd3a005d54357a647a693ad50/16007967285.pdf
    • http://fautographie.org/images/userfiles/files/30128965693.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2ce77c12065a25582d3cef179adb5097/zidinujesivigis.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607973650a3c9---22980764502.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608877f925e25---podinuvirova.pdf
    • http://metapolar.hu/tmp/79777951283.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160702cc2ded1f---zedapawubezaluzumiwufomip.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1129009d9---mikap.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec6f582d9b---puseguxuguke.pdf
    • http://szao-spb.ru/images/news/file/xagasomilobagosi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=physics+book+for+neet+pdf+download
    • 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_off0000f2f2.bin
36befed4a337b65fc7058c29f55d36a8640b5970617c9ce8dbc8e1dd93fb036c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 11148 bytes
font_01_sfnt_off00010cd3.bin
afc625febd40d501e6f82e93028a9372b3708d297aa4b62290058fb6daa86e6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 17432 bytes
font_02_sfnt_off00013a3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3A 16792 bytes