Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c56f48914dbf0e…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 13:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98d516f36663efec23c1d4548a5e4f0a SHA-1: f0ffc1371161047603cc6ac1960eb94b1c1f67ab SHA-256: a3c56f48914dbf0e6c6836ef87a7f23c7fd58f070a67d1e2fd7167f10b040e4e
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608391fe5dfd7---81570284461.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb79cb6929---vumeterowisuvuwop.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/be1f1c0102117a2e9105a85d011a6763/28763973347.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/laniditowaxuja.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//monipowuwarivagenup.pdf
    • https://yz-yongzhong.com/upfiles/editor/files/93572131442.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/k2744f8godfve5ap5m02dvigrc/mamijezajibiwezopinoxukeb.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8d36fedbd4207b9eebe5eb2028fedf88/ragoziwemazeraxab.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd673613b---wivorarasitolawaxenivigo.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/7a3680fe20140e7ef8c960c4ce7b4347/moxagixi.pdf
    • http://lhs1965.com/clients/880801/File/gugunefarisukij.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/35159596202.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607501b9c8b29---getolasagote.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/bajapukab.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/xezuw.pdf
    • http://skkouty.cz/ckfinder/userfiles/files/lugexaselirotapiw.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a97db046de2---41694843763.pdf
    • http://thedreaminitiative.org/Content/Admin/uploads/files/visilijafokit.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9ab757d37ad4d05bbe9e6487995b11bc/54889659987.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021531519429607.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9eae30c143c4a67bec4c37f5d641f62a/99484925356.pdf
    • http://goldenpeak.it/userfiles/files/dokupoliralixesiditaputa.pdf
    • https://alexandrapanayotou.com/web/images/static/file/58590989383.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1608cd1e318317e724ffc6ae32fff33e/65132590863.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dreaming+of+faeces+biblical+meaning
    • 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_off0000ea9e.bin
7315962e572504ed94ce5fbe89feaad73715b6c34d448230ad882c52d175f521
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 10724 bytes
font_01_sfnt_off0001032d.bin
0b033252f37aa5eedf24625fe22df2f3ebb54ea5fc1817bf78e8ba8d0f7bf9e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 16352 bytes
font_02_sfnt_off00012d7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 16792 bytes