Malicious PDF — malware analysis report

Static analysis result for SHA-256 3769b171b5e814e2…

MALICIOUS

PDF

86.4 KB Created: 2021-08-06 15:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f74a44f39e253186eb3da8d96cba6b8c SHA-1: c08fdcdbb547f956a358149180ae3988284cd8e3 SHA-256: 3769b171b5e814e2d7229add5403aa1791b9a04a588838a8e457e6e2a9e1af89
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by multiple heuristics flagging it as a link farm pointing to compromised WordPress sites and potentially disposable hosting. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent. Although no scripts were extracted, the document's structure and URL patterns are consistent with attempts to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=how+to+get+cia+files+on+3ds PDF link annotation
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd026cccbc---22015661506.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/72336626984.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/73115068315.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/88614152980.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/zuvazolizuzogirer.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160864c3653c2c---69423315561.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/vegiwakizazigapidiloxa.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/de65940e1212497f3a0be8b9fe22590c/jakuxomo.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/57444852686.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210702112800.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051606544452.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/5ke32i41mpjcbdursauf296cu3/10284141506.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/kemudupamasaderabiwur.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/e1vs9rmu439drdjj525lj5i0h5/guxonalukuwi.pdfIn PDF document text
    • http://naucseto.cz/storage/rolaxekasepufaxowopazep.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/kqs0mh9000h0sa5mn2tnj5hfsd/sikoburobufewubujoz.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/radewozenadutujeriga.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbdc4dc3e4---80788986666.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gababot.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/kinuguxan.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/timow.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e215cd58868---57200608647.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0b4bb327---wufapabexopi.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/sexufato.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f9da7f7f---farijarusodexatezogam.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_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 10800 bytes
SHA-256: e1c5f08c09213f63f0564706df4ded787d470c279b6304b4ef7e9b1d951b4943
font_01_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 17424 bytes
SHA-256: 6efd7e293107d7561bdd695e306908a967ce29a71681dbf8cf6965b4fa032da4
font_02_sfnt_off00013381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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