Malicious PDF — malware analysis report

Static analysis result for SHA-256 900743d4d3cf779e…

MALICIOUS

PDF

140.9 KB Created: 2021-06-29 13:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d60dd31ac58dfd3174583c8634929d4f SHA-1: 6ab90a02d4cec40f1726c08fc395a53557ef34bd SHA-256: 900743d4d3cf779e1030400f22d12363ab3fc31f51b1e717ef92d1a6f7270d88
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to lure users into phishing scams or download further malware. The presence of external URI heuristics and link farm indicators strongly suggests this document's primary purpose is to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://philabc.ru/uplcv?utm_term=xiphoid+process+location
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb6043b11---wutotewavarizatalizari.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/03b9161c563d6b3034536ee46be770d3/xapasidi.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/fea98432a009fc74e9f71c5958c35d1b/84256297467.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/i9pe7bf3ju1pic5fmk60sd57ou/33945613425.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/002d32ed4ea46227c3525404e15617ec/gadudulasavesozelibused.pdf
    • http://kbchina.de/upload/99141692933.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8cd81da91---46820208259.pdf
    • http://allprintusa.com/admin/images/file/40397455658.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1b4ca57c---vosupajakakawukok.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086b03b0c582---24769987821.pdf
    • https://mimpishio2.net/contents//files/lanujakezomixapibopotonew.pdf
    • http://schokobrunnen.com/idata/rimefokiwikoxamag.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4t0a5v4lc6jjan92o07e4mmiok/1449092242.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/945d1d69a46899dfd166536092f0785d/wosibubeti.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/zejunizijujapin.pdf
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/69670772932.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ce1f7e5d219258602c3d006efe7e802e/89875317929.pdf
    • http://navigator-nsk.ru/userfiles/file/dusajamezumoxanonop.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c99434634e334e010a1bd1f9d5f345a3/66567998823.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-6-1/20210601025223428820.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/71889756299.pdf
    • http://ibb-online.ru/f/file/29254414064.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2ede5ba55a1132c1d2ed488f84a82592/35454590736.pdf
    • https://a2designbg.com/userfiles/file/pagulano.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717de7c06dc---83167290806.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_off0001c8e2.bin
fd30fcb958070f662008267537b6d2f224dce02b5c6a01446ef60c25320df2c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8E2 10620 bytes
font_01_sfnt_off0001e116.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E116 16792 bytes
font_02_sfnt_off0001f928.bin
c1b2d2e9193c89a9d92e4db54d01446bef259b70327a75871ba23a3d7c64f43b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F928 17412 bytes