Malicious PDF — malware analysis report

Static analysis result for SHA-256 eabf834698c784ba…

MALICIOUS

PDF

103.3 KB Created: 2021-08-11 22:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0aa5c85fdb1565e27ed0376805d185ae SHA-1: a1e01c4b5a7db3aa9803ee7e5fa86086a62d320e SHA-256: eabf834698c784ba648107dd431f3ccdac657f7b3a7f44c1cc12d271c5b3d4d4
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=proyecto+activaci%C3%B3n+de+la+inteligencia+%28pai%29 PDF link annotation
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16102c89d3e2c8---76727302085.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/59397003479.pdfIn PDF document text
    • http://metall-press.ru/files/69524917478.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/84353840119.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4f8b95945---belokazeze.pdfIn PDF document text
    • https://clove7.com/userfiles/file/75608853501.pdfIn PDF document text
    • http://orderkai.com/uploads/files/sewopoperuvaxepis.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/90506770732.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c61d99e9980---sisegivojubitito.pdfIn PDF document text
    • https://goodline.by/userfiles/file/21044595258.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/tcq31raj8utoloqbmor9cb3tbi/16375441324.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/24835072323.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c44ec7fa2---54476372533.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/b0m2dontdn6dcsasf1o38gb8e2/55589485948.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/disorebujugalodak.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/dujukatafoxasome.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97e126168---dubupakar.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210806_13F3223DB8451B96.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27d677bc3675cac29234ae025fc9a3b8/vosipuxabezej.pdfIn PDF document text
    • http://healthywithhart.com/res/file/demazafomul.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/3735452436.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98f4d7532---71236598793.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/75227121054.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_off00012b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 19100 bytes
SHA-256: 4e1070ed64afbb62f9e05a151667ecb959925962c98dd387df1857dc7e3aae5a
font_01_sfnt_off00015ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA9 10996 bytes
SHA-256: 814dc3d70dbd38868817051cd978c9e5fcb98b916b7fb5384ad4a201f1957247
font_02_sfnt_off000174f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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