Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed0c55a63ef3582…

MALICIOUS

PDF

98.4 KB Created: 2021-07-29 19:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 483b7c1783ecde37d42066e0cf06b57c SHA-1: 9030180386d1721d314eab1fbf6fa8d012df5202 SHA-256: 7ed0c55a63ef35827b6c76602a3a915311bb33d12d33c612bd170a92c592ce54
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 ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution vehicle. The file functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://masihpt1.com/contents//files/lixexibenawirususi.pdf In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608217b4993c2---vidugizir.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf07fe0eda---jikofijubegekuxi.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/80533166090.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ab81630025e6c1b3fd54347378fbfbc4/42718632567.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/63052656861.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1857ff80---57161858843.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/92300804339.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717e66e4f58---19097619663.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d672cc4c---mopijabara.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6f111f60---1925758716.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/tesejegejeramonux.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a5fac0b6e---55701106455.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/991cb78848ea830e79d4a2d9d600287a/riwogoperonakibi.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701264a7c66---2499298313.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082227ce515c---63891101943.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fifozo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-16/20210716224717649753.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/99c41dad6446e44f2685ac2ad75e575b/vokuxugowexufekosegedegel.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6201bf3b---tefezatijaxemuvakojozila.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/29872115329.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/89n59t6r1uf5rfa35hth4ea395/zudugeperupupiv.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/35826709490.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/73380525848.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/sugagejikibeforewazukeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tier+list+idle+heroes+august+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 10728 bytes
SHA-256: 14637c455d7924e7a41cc46d3b4f2d967a87217763d469affdfd5ee109f4f2bf
font_01_sfnt_off00013470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13470 17080 bytes
SHA-256: 62332773eacb66a977dc39ef19a26787e1579d81c7d4074c5e9a482918366fc2
font_02_sfnt_off0001609b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1609B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1