Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20f8f1e7687fe0b…

MALICIOUS

PDF

110.5 KB Created: 2021-08-17 18:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5ab3d92e52245980dd21849e4b969b8 SHA-1: d2111518ab3a4cb6e62f94b86028440ef9b59a16 SHA-256: c20f8f1e7687fe0be25f6340a7f05e2cc6b58fea4268ab77c2e4b2665d006dde
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links to compromised WordPress upload storage, indicating it's part of a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to exploit users through phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bb297fb2602---zaxedaxa.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dcc1b50bdea9093949d333426ee23cc7/vasokitewizijema.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e578349f0f4---fadizufamefe.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609270a3ed321---63972712944.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccea7404a3c---tamuvubosaxogonudelofefet.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f92ead307---samevofojuvodukalexoxo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160817789ab683---bemanobutosajosena.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/24479521591.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3gue8535sto50ealpp3dnupliu/nujatiwagufexagur.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/peruro.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dh7b57s69rgqrk64qn7616sg2k/90958032282.pdfIn PDF document text
    • https://bachson.net/upload/file/xokimabiki.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/83ef5dcba7f63bb381af3c62751d7d51/93000308979.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/gusago.pdfIn PDF document text
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/vanitepijufopek.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/palunenu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/37301127216.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889e2bbc956---13405900736.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f338e0836e125c7eed0758300e6d5075/nifisaxulonidodufutil.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1627244342.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/siselebapafibos.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/23759984237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mitsubishi+electric+mr+slim+error+code+p8PDF 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_off0001493b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16152 10956 bytes
SHA-256: 8f78d166e4c9b94b27b939b9435db4564186dcc73b3186fe4661291bf879dd33
font_02_sfnt_off00017a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A85 17728 bytes
SHA-256: 862f4887a70dde5a2693c879efd91b2461dba5dcb4b029f51f8c07e2598d8a1b

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