Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6502272b095a50…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 20:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f373bb1d816f9ffe36072e5df12f139b SHA-1: 306395c15061b76258c0686de1e4a6559f5b1cd2 SHA-256: ec6502272b095a5034a50e6e6a0cc0a3071be07d395a58f877f9ad6c7044c8fa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various URLs, many of which are hosted on compromised websites or disposable domains, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://mk-promotions.com/ckfinder/userfiles/files/54293504859.pdf
    • http://pm-ural.com/uploads/files/8395497239.pdf
    • http://versobrokers.eu/userfiles/files/55060108547.pdf
    • http://www.farnostbobrova.cz/ckfinder/files/34747513858.pdf
    • https://gulamanis.com/contents/files/78051653595.pdf
    • http://polipack.ru/content/file/nujojelobo.pdf
    • https://podgoricki-klub.me/userfiles/file/293181098.pdf
    • http://austria-ex.com/images/blog/file/wewimoboroxofowaxuguka.pdf
    • http://epmresearch.org/userfiles/files/43497683095.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/26596692214.pdf
    • https://crc.creativechange.net/ckfinder/userfiles/files/fonekumega.pdf
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/25933599619.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1d6f96b20855bf66090ba9b0e9485eee/72827572805.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161339553350e1---radatofezarurenemu.pdf
    • https://clubkdo.fr/img/pics/files/rorot.pdf
    • http://fanta-life.com/userfiles/file/morarokogozupilida.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/nonowisegizi.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/wefowotadefamigepukogavu.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/jamejewisemugirowigeru.pdf
    • https://airin.lv/images/userfiles/file/lizase.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f74196d7ad67d82c9bd394dbad17798b/kepekorojuxobaxozexipupa.pdf
    • http://cnsgafgl.netsociality.com/upload/files/21206228808.pdf
    • https://austdoorcaocap.com/upload/files/dejibuzedujugagibiroz.pdf
    • http://currycornersugarland.com/admin/images/file/52172602166.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+gta+5+apk+vision
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad8.bin
c820281f69d6cc784e206ce565e97c5072284822645e2e5c651e12ae26243217		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 17408 bytes
font_01_sfnt_off00010799.bin
8bbd0335e677d26fc1af55d5d8ecaad79a111249c10bc3a556ee0288354fdb13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 10712 bytes
font_02_sfnt_off00012039.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 16792 bytes

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