Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a17110be7d6d41…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 14:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a37bc1b2397d6496c254ab15133f902 SHA-1: e18c921dc78b0c5276ef43ecd7ca6cd4817b8173 SHA-256: c4a17110be7d6d4150b181cc6721855c27d730a1d5d86942b7868e343342cbd8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The primary attack pattern involves directing users to potentially malicious external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f7408b3d27e---1072686767.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/44445152081.pdf
    • http://cobmedia.hu/include/tuwidoxunowerunavutovi.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9c300a81d455c9428d48fbb9052aecd8/60198155663.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7426a863d---96615283882.pdf
    • http://mictrogiang.com/userfiles/files/53547491643.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2f3235f3---tafurobakupubopekebawepu.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/radisijod.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd62738f75---jufufewufenodewupafijuw.pdf
    • http://vyveva.eu/UserFiles/File/53831516145.pdf
    • http://sungder.com/upload/selefawenozasiwuvuliri.pdf
    • http://technestudio.eu/userfiles/files/6981348721.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/i96ebluc4grpcrcce1an7d50dk/69365994776.pdf
    • https://poojaindiangrill.com/nbloom/fckuploads/file/gejarekonejub.pdf
    • http://gd-weimi.com/upfolder/e/files/20210730164523.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872ee22f9ea---gegitalowuselapam.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37370710900.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c24792a0886---wikanutixozitotevini.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/loa81134nl1rfpuf78ss4q2m6v/dizebuni.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a905c8ed5c4---62415037151.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f54e766ace2---11627795459.pdf
    • https://ptogel1.com/contents/files/70546052613.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/17630563120.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/kalimo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d7c755d9---wowosajemib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=divergent+veronica+roth+free+pdf
    • 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_off0000c409.bin
73f153da13c7ac21d3e375df5ab0ccc8e764dff4bb072f4ee8f64d2797d8a1ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xC409 10752 bytes
font_01_sfnt_off0000dc82.bin
442d768bbe00391154d059eb0cf1ac552a9a18025450494bf632895b28317c1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 17500 bytes
font_02_sfnt_off00010a42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 16792 bytes