Malicious PDF — malware analysis report

Static analysis result for SHA-256 79304771ecab62fe…

MALICIOUS

PDF

90.3 KB Created: 2021-08-11 15:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7393a53cfe5c8f8ed24b31670853beb SHA-1: d0e22614cba57fe5429b57c7002d99f5c1eb3b0e SHA-256: 79304771ecab62fe41d8b611167a1b40c0e2543fd9bf2d7c28c8a7b48bb353a3
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=mastercraft+courser+mxt+35x12.50r20+reviews PDF link annotation
    • http://fsanaq.com/upload/file/2106290543130468777h28xzntrmh2.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/medumivasagitomurabal.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e3840ac17d8b77971f98776063d320d3/9492158210.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160849f7f0f41b---9754246469.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609538043bf11---85494976997.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/binuxesizaribepurawe.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/gudaxubiso.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/zefumonig.pdfIn PDF document text
    • http://gistys.com/userfiles/file/gugisipozapu.pdfIn PDF document text
    • https://viettrungson.com/media//Files/gojodajukudetirazevisexu.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/dixusamebobi.pdfIn PDF document text
    • http://954move.com/clients/4890/File/xixifijufenedum.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/48314872750.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/82668965758.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/p49fb2igeeteograq7ffbi0q98/80429409759.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/762cfbf2d2f84471dbb34f00d9d1cd80/55636751255.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/kelosiviv.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9d05aa75---laxadoposo.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/55850476753.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4961f9773aad29b1884afd3afd4202e7/soduziridopava.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/74982115880.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607247057aae0---liretijusapubufij.pdfIn PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/57694698533.pdfIn PDF document text
    • http://midel.me/userfiles/file/12657874277.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/50706087420.pdfIn PDF document text
    • 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_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 18032 bytes
SHA-256: 983edbd97572f1d9def517a7eebfc71ed2096481cdfcc70a99aa314cf0accd3b
font_01_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E74 11360 bytes
SHA-256: d21f43362511e143093bc9f0faa7fa9e69d39a1d7b7b56395f2212afb5bed23d

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