Malicious PDF — malware analysis report

Static analysis result for SHA-256 edab04f6525663b0…

MALICIOUS

PDF

68.1 KB Created: 2021-09-28 20:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d798eee1b56b163013d971d5230ddae0 SHA-1: 45f69e9594a943e65c0e10b5a98777b190ed711f SHA-256: edab04f6525663b09afcf3521df758ee78e6f94cfe3e96fa615d8fb0e8b06e89
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, containing numerous external links. The presence of multiple links to potentially compromised CMS upload directories and disposable hosting suggests an attempt to distribute malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely involving the distribution of further malware or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=android+studio+icons+download PDF link annotation
    • http://taigesw.com/upload/files/94625297281.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/xokedudew.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9df5a847b---10702792017.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/suwafutuvuped.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b17b9348d5---88617992845.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/16685831993.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/19181266745.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/netid.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c81d453d7dd48fc4c0be0af0d0915508/21512658523.pdfIn PDF document text
    • https://jss-moms.si/upload/File/66965494996.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/59483904658.pdfIn PDF document text
    • https://mashura.co/userfiles/files/xeseni.pdfIn PDF document text
    • https://olterus.net/contents/files/duliwomerirezur.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/31071840.pdfIn PDF document text
    • http://sial.pl/galeria/file/62557564032.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161401e20502d9---zudativogabodaj.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/petosidiw.pdfIn PDF document text
    • http://schubert-hh.de/image/file/waxowufuvozavegisixegite.pdfIn PDF document text
    • http://chamdure.com/DATA/files/21145167526.pdfIn PDF document text
    • http://staropolski.net/Upload/file/zubopojanozumeguba.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/jefasodolegazagudizurugo.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/20268069745.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/mamuv.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/doguxevapotibikusegad.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_off0000af62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 10396 bytes
SHA-256: 24767e9b5113c8122733767802a97b8f425d064f006d1212710cea87b91eca1a
font_02_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 14260 bytes
SHA-256: 4604a13f4c49bf28aaf73dbdb35ee737404ad34de7d2981c1d448eaff69b1f9c

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