Malicious PDF — malware analysis report

Static analysis result for SHA-256 672908c04e0e912c…

MALICIOUS

PDF

84.4 KB Created: 2021-07-04 02:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a635beb8d6b83a351f07d1122c42ea56 SHA-1: e22026a470533517fea77a1466801f9452acdd2f SHA-256: 672908c04e0e912c7524ddaa807ae76c86cbbd5ac9d3f5f69a57ab2a294ba55b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=how+many+jumping+jacks+will+burn+100+calories
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7771e1966e---72825735694.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/fcb88b510dbf30deea0503b68e5395c4/bizabelamesepedos.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/f3ms4bv5eq85s68f1urid3m7f6/17326066591.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8875e523---51319119760.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607781683396c---gukizenaj.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f790884f2---nebobot.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7e9f610cd2b1aa364325b2fd05bc3dab/7724830814.pdf
    • http://alnadaoil.com/userfiles/file/28232247080.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088706810fd3---26790306676.pdf
    • https://sssmri.com/ckfinder/userfiles/files/81142152366.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b19cc8214---dizejuragedixive.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae7dec1c06---24384183834.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7c6e1ed7b---sexogoz.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1078a6bf605dd15301c85e4abff7f14d/zofajipetawufobu.pdf
    • http://coffee33.ru/archive/file/52202971669.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607956e8d7e5b---61152466053.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/79f0702fa47d78dd7ccf82542c10ec4f/54272879649.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099813124dd4---rovilikejubonekoxadi.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0389e33d3---dudiwatekufalagat.pdf
    • https://planet-for-events.de/userfiles/file/tudejevisamalifeze.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_off0000e5ef.bin
4ccbd9f4587dc8510d9d052ee407b4c567593695cacdd4ce0dfbed1e97d0038b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 11444 bytes
font_01_sfnt_off000100bd.bin
cd0349a17d98a8765fbd16a9c1f727f1e551becdc268f96a8a14f87e9ea774fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 16712 bytes
font_02_sfnt_off00012c36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C36 16792 bytes