Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7650873c12fdd33…

MALICIOUS

PDF

74.9 KB Created: 2021-09-08 06:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f1a3abb00d06bcd03572fec87e486d7 SHA-1: b720295db60017d87b2a51b7efe9b80edcad67fd SHA-256: b7650873c12fdd335ed9ee95fdef2ac65493cc43a80d6e45fc3a08f561581378
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://alharithiforcameras.com/ckfinder/userfiles/files/jofapiti.pdf In PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/27735067278.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/bepowedinalasatetefav.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c96e5a452---41564416088.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082507901529---64294289202.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160919244db301---fejosew.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c22d6073d53---33838695591.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083390084ddb---linadabuw.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607106fb2f0ab---69332014476.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/58301770032.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/88619491235.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/cca38cf9fdff146c3948ce69b00ee399/todadoxovime.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ddfc4de87323e818aacf37df1cc97088/87201735289.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/14829499095.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/dezidaxatogikor.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/89192478749.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0t7tts6o885njf14j0r4ru38k9/jusetitaboditem.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c5e6784b87aa1cab3f1227e321ae50f8/tazemuro.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac1da03cb99---66975185298.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/zobopitojifi.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/38836867090.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/69076614841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=you%27re+the+one+that+i+want+piano+sheet+music+pdfPDF 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_off0000bfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 17212 bytes
SHA-256: 57ce6ce42b697699d7fe1f35f83f9859a1c625735a3926efadb85622c80bd202
font_02_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 11044 bytes
SHA-256: aac06fdda613f1e43511e65702d0738d1e0f22c3dd2bd50b2b5b8fa5a926048b

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