Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aedbe0ef3f781c7…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 22:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca0d67134f473240289c6d1df4e461ae SHA-1: 7b16d05e8430e75841fa7adadf53dd571346d9aa SHA-256: 8aedbe0ef3f781c75b4ee53f8bf96f6e445c2c1d6df22a6b4941feb177fe5ccb
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. These links likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138a292c4ab2---pijole.pdf In PDF document text
    • http://fixafilm.se/userfiles/file/80997789369.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/tefekanugawi.pdfIn PDF document text
    • http://apsons.eu/files/file/94973020000.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab8e5e57e---51362239548.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/xixatemerufofubeja.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161355e5388ac8---86312635184.pdfIn PDF document text
    • http://reichspfarrer.sk/file/55551649207.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/9009747466.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/36283251474.pdfIn PDF document text
    • http://186086.com/upload/files/wozuwuxoradabevidenate.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/87653280533.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f720ebcdfe71ad343d47d7752629c73b/46465642460.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/91501281012.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/guvafaj.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/fedofewegabuzelibukap.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/32972385499.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/53554585501.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/gimonolasuregadebazerasog.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/gutogano.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/wotalosesawibawufaxag.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5cc81d9d---57127656646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=racing+in+car+2+apk+hackPDF 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_off0000ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB1 10344 bytes
SHA-256: 753aad13c68879d00167bc121af4cea58dc3013b458cbe66fb69c6bbbbd45fc8
font_01_sfnt_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 17672 bytes
SHA-256: 619447f86b416022bc02f7847293e429f0e6a357c3d8968f5e320c234ec7c263
font_02_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1