Malicious PDF — malware analysis report

Static analysis result for SHA-256 84427a75cad58bf9…

MALICIOUS

PDF

85.0 KB Created: 2021-08-29 01:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c905b0a1a689744ca9bc63a0fda4af26 SHA-1: 9708d9ab181c4c2912199689b47a34110564bf1b SHA-256: 84427a75cad58bf920b0a31dd1696e8935d2153162f36437e6184201445f6f31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. This pattern suggests an attempt to manipulate search engine rankings or distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aquatrustfina.com/userfiles/file/baxixekuwaterelowumuku.pdf
    • http://sonsuadogo.org/Images_upload/files/nejevebuzewarofukuxusoju.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210816_BCE3260419E97BD6.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/89rj2o78ob1kerslednpl22aa7/67020122586.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/vepiliwu.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b026ea4ff42---libovobatemaralil.pdf
    • http://martonaroniskola.net/userfiles/file/liref.pdf
    • http://anvlaw.com/userfiles/file/bofixivubekimevi.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ouc90b64g3b1oi1dj0pv1cbfpg/mabudurutov.pdf
    • https://cubic.is/userfiles/file/41146299399.pdf
    • http://gtshotel.it/images/file/91879277531.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160841ef156ae0---waxadadesegifirime.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611d863b4de4a---65797070676.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ae4414847---77696582810.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611ade0531c93---polape.pdf
    • https://upaspor.com/resimler/files/88454859631.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d9efb3116---verilobirinifaxet.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021070311032880554.pdf
    • http://bluecars.pl/userfiles/file/raselugaxegex.pdf
    • https://indirimlipin.com/calisma2/files/uploads/dujenadovomiwifawiwogud.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081d36ee2511---82124345243.pdf
    • http://alphasigmaoverseas.com/userfiles/file/29124193365.pdf
    • https://yasacompany.com/upload/files/79039556672.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ariens+deluxe+28+snowblower+manual
    • 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_off0000e64e.bin
0421dd1bb25ee145f5e8380b4a0229ed5711547d0cc909244ec24ac5533379b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 11048 bytes
font_01_sfnt_off0001001c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 16792 bytes
font_02_sfnt_off0001182e.bin
7f7b4039402760aabdbd7631df13d7ea1fe07c4a4192df266ca20b98ea89e112
pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 17200 bytes