Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c3c175f75ea359…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 12:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09c14ac584d65fbf0f4632d2ec9a4d01 SHA-1: 78d74c96a8b66d3dc8907d64eae1fc3a9465c4a0 SHA-256: 86c3c175f75ea359ab693f3c45595b722cbaff15e16f51beb274c3dcca97e80b
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to direct users to potentially harmful content or for SEO poisoning. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=android+send+email
    • http://pushgroup.lv/userfiles/files/71582697608.pdf
    • http://stopguepes72.fr/userfiles/file/90958592325.pdf
    • http://4seasonstours.in/userfiles/file/mulumukobudag.pdf
    • https://electrodomesticaruano.com/images/ckfinder/files/22241221071.pdf
    • http://allefrgycg.news-read.com/upload/files/binoxiga.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f75bb43b50---13802224461.pdf
    • http://alkanboya.com/files/file///70137131301.pdf
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/fojawexurarulododutag.pdf
    • https://ekransamara.ru/files/rumupowage.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/56f829d1f2303c9f28d1720abfd1a59c/20327879715.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161368418d00fc---17672647486.pdf
    • https://konzolstudio.ro/uploaded_files/file/95971589357.pdf
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/nanilurowikex.pdf
    • https://artgallery.devctn.com/ckfinder/userfiles/files/ridowemejagipafomofobelok.pdf
    • http://dvg.asia/ckfinder/uploadfiles/files/ronibimezojosarivap.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/75cac08ee36e11af6e53fc5cbcd7ba05/riganisamag.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/lorarowatuxadi.pdf
    • http://weldingplaza.com/files/file/20681890252.pdf
    • https://leise.ru/admin/ckfinder/userfiles/files/82542209237.pdf
    • http://reklama-kemerovo.ru/files/files/28892558113.pdf
    • http://archpiudue.com/userfiles/files/jegulimoriw.pdf
    • http://xmzhj.com/UserFiles/file/zevuluvoto.pdf
    • http://mazdooradda.com/userfiles/file/ninawezafulikibofan.pdf
    • 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_off0000dbe9.bin
0f9021f2ac652526a70cb9eb1bc3005674c21d6c2b7f5784d58e0edef77666ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 10292 bytes
font_01_sfnt_off0000f305.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 16792 bytes
font_02_sfnt_off00010b17.bin
0d054015c350bfc0b72b48deb06ff95dfe5e4dd467e54816df34ae06db74ffc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 17232 bytes

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