Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ff3be76d082e67…

MALICIOUS

PDF

93.7 KB Created: 2021-07-01 00:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 00be4fea3c6401079ca0ff7589d7a745 SHA-1: 3f1bff48ae92d96caf85cc1c3be908f82a4af81f SHA-256: 76ff3be76d082e670f755de2c28bd2819ce18a4cf5f568c36d30f084a7c2bd3d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://infrive.ru/uplcv?utm_term=teefa+in+trouble+download PDF link annotation
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/9iuubc0e2td15vktejemnaqu64/4764680048.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d788a6b3cc6---76110123158.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d01d76e18ba---95490457375.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/40235673527.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/cd5caac3d3b59beb13c3f14bb7c08982/liroboviwobanujuwamokuz.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802cf2e751c---jexivozivodol.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/nekovanudino.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf02489f72b44d9bc12dbdabae8b5894/miget.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/8efbfqhd44biujcc08e90l01qu/kaxeroridiwomatigunidima.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2cda90a2bacd3cd975873376217e1c2d/28311861640.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/23690165114.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160786825196bc---44024053462.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/titebuvunom.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607de85925b5c---90744625517.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/11205447014.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/14987756392.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98a3bd98dc---29996465890.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/29alfqjuigcqu4i8nvb0qc7205/74741378279.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47aa17c97---27170043356.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/wudululejozotadijo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092256ab0c44---15688015282.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/27fee7bea6baea1563e3ae002bb74f3f/30487933369.pdfIn PDF document text
    • http://18554080.com/userfiles/file/zenawoziloneniziluvusomox.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/52635072494.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 17988 bytes
SHA-256: 81dfb33fe92c556988188b0d16321b0675f83396516f35bd433bc91860507da3
font_01_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 10468 bytes
SHA-256: 2fbb96a0620821e0769f2deefbfc330a4c46c40d2f6d6f30fdbc3352cbba546e
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 19076 bytes
SHA-256: 8f0e97f378ddc43ec7c47720329dc5aa11ee3a64a3719e3abdc287986343c3e9
font_03_sfnt_off00014eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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