Malicious PDF — malware analysis report

Static analysis result for SHA-256 305f2a7e6c1863bc…

MALICIOUS

PDF

101.6 KB Created: 2021-08-18 23:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da2e20c3847223d9849ef340dbc0baa4 SHA-1: d4425e880b0c6d3184c0c84bbd1ad6ef5ea8c4f4 SHA-256: 305f2a7e6c1863bcd4bdd32c5d30f501d49fcf0f410481c0f4fc574268c699a9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The presence of a callback lure heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://palyavalaszto.hu/teszt/upload/file/32044168972.pdf In PDF document text
    • http://eurekaelearning.com/upload/news/file/sidasefulotuvok.pdfIn PDF document text
    • http://gdaniec.com/upload/files/77175405993.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/89522129754.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/8f5joeedbfjvcu0nfaugi6vp2q/bepadugusuwudosar.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8680fb9c54f6db416c39af7ed32a36d9/2469481455.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/gudopajozowaganuvalazi.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/daxaluz.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0c0ab5d5d167daf18b43f996091433bf/vevabuwigupanobobid.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b19d4d16---59277471999.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/9a42c496286fd87bd038208a04f2bd1b/62576478396.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/zojokalasemavabarovolub.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c98cc3a9207---51821697988.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0450076c---36039296257.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16080882568cfc---44552247956.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/67606454881.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a7fa3838---65548071413.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/12145600015.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/81220367459.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/jorivoxopamijufekoli.pdfIn PDF document text
    • http://jkohut.pl/file/kizam.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c47ae55f50f---nibalowinomapiro.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f0aa363f5bc---selamupifufexipo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/85397081cb86a82183d6f0eaaa527ada/6680251721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gta+v+story+mode+money+glitch+pcPDF 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_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 11180 bytes
SHA-256: c2a4b72585859a18104d4a4464e796a2a251eb954fdf099390c6f321f5ef8cd9
font_01_sfnt_off000133c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD5 25004 bytes
SHA-256: 1e804b06a20b48b900d34af3e1107e5b3522a05674980c5990d67a7d3e57c1a6

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