Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb2fe771a8b76c6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 11:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f80ef43006d6230b23a145b5baa0ef3 SHA-1: ba91bfd29dd80a05fc6168cbc4ad46594719e0a5 SHA-256: 7bb2fe771a8b76c6745e2b3e2bddedbdacd947db1bdc12bb3e4de8ae31a9af8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and the ClamAV detection 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dc11dda4e1bf3352a36c60b0e4aeeecb/59846482092.pdf In PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/wikalojutidavakuku.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109050206484363.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210911091948.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61395586abd67.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/jofuluvari.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/wefowotadefamigepukogavu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/ribitovomag.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/28361291400.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/zozukekud.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/guzedusazagosujinizas.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/7776452393.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/fuzojowile.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/lekitulewenufexeralebeja.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/26994135512.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0a3dd78264499702f8c43ff94a7f1ad1/30001024507.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/96674673623.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/lubatuwekekafuraleve.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/pifebonamigofiletotoduwo.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/7333914514.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/xizolobazizifepulofaza.pdfIn PDF document text
    • http://receptlap.hu/files/temujan.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323b55f3b11---49785795424.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/41432602707.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/fajarine.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/40384435975.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/jaxesexirupeloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+emerald+party+randomizer+downloadPDF 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_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 10740 bytes
SHA-256: baafe364edb248f0105593d195aab1094ce5d0c4fd2068228593241b4572cccf
font_02_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 17984 bytes
SHA-256: 4824a141ace188df5593e880239b4b12c51f3ff514bf9e3f84bf87ebd2cecb99

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