Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ef7bb15408a690…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 20:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae3afd5136e0d0e6deaf6dc426d9a7bd SHA-1: 7741bb50bed4369dda16cbcf83ce1a1ad51d083c SHA-256: b4ef7bb15408a6902b571cc34c6bc8fe39ceb7d82c7681f69b6de257f28ca522
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://nomylo.ru/uplcv?utm_term=logiciel+educatif+pour+android PDF link annotation
    • http://sspvjd.com/FileData/ckfinder/files/20210910_E4A87540291466E8.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xogojobesijakovamo.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/pajejofafofesaju.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/42890869160.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/soxotakipifetasig.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/dajozakogikuxoxuratal.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/gorekosolosoruwawar.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/36803638909.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/99439055140.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33530cab8---72422163541.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/90432194740.pdfIn PDF document text
    • http://karczma-zaborow.pl/userfiles/file/23300965843.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/34399505134.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/78146521959.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/15494787012.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/luvarodufefiwuj.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/8857555491.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/vobudajobumaxog.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/jifafoxegekagubigonomuru.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/91633333525.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/gujotofibazitexo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130058a8176c---xixonok.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f68c9f76b---lamabadomuliwunexumexak.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/miwatiromojudifanedonerip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 10684 bytes
SHA-256: f473c43f752d308dd2da78580d488e6ffb69ffb1d02a71ef5f71844da677da4a
font_02_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 20516 bytes
SHA-256: 867b59de1e99efdcbb7724d209511056e978caa0d0dbc003c30c5aea3cf70648

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