Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf2a292d01a11c4…

MALICIOUS

PDF

78.3 KB Created: 2021-09-24 02:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 206a1af35b018754c948af48c8340065 SHA-1: d2e5951de70e6e9b61d0174c38254daa3a58a6f0 SHA-256: baf2a292d01a11c450ccfe1425ad4dda01c9fa7b6a97f7e6e66315b5db900e87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as link farms hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the structure of the document suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369f9c7669c---zupixokapovuwe.pdf In PDF document text
    • http://elcampoeco.org/FCKeditor/file/xijoraminojowejurukufo.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/23128435479.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/vudobikunonetijolirituf.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613593dc08ecb---meworuxawopotopomawane.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/52257194403.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/19415399092.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161409fea66ec4---40137135702.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/c9b525daacfd14f03883a8bc4a929f2a/vekabakopegumipixomomib.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/7019550205.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210916165636.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e237a26a3---jamoraxokuvew.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/77833111788.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/golikesavebazonifo.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/1a05a87b41132683fb3ed4ad881457b7/15490937915.pdfIn PDF document text
    • https://blugarden.eu/file/sofomububeluweriliwuju.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/77716216376.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/95406355694.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/35760596941.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/97469757109.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142a86012589---3141359976.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/vipirixokafizofodur.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132287cd6b10---zubegogita.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396dd36d529---kejisefedufutax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=skype+for+android+autoPDF 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_off0000d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 16412 bytes
SHA-256: a6042b134ee3bd48d1d77a2b5d4e6f9e1665f372fecfd9bcf6b40cde1ad35a86
font_02_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 10660 bytes
SHA-256: 5f4518b9f9dbc6675f323cb3ab874dbee429f837f73ece679d13680582876a26

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