Malicious PDF — malware analysis report

Static analysis result for SHA-256 963533a87b72aeec…

MALICIOUS

PDF

75.9 KB Created: 2021-09-23 23:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2392ca9ace75fb3aa6edbbd85c9a2325 SHA-1: bd1b302167d629bc2c0e0622261f37018f4fd3ee SHA-256: 963533a87b72aeeceac4ee488fa7ed3bd7c979500d77b6dfb449c8bebf4d8c4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide clear textual lures.

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://inwebjor.ru/uplcv?utm_term=final+fantasy+psp+rom PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0fc03d10---96673795697.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/limekeguwuxed.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/75916893262.pdfIn PDF document text
    • https://bagstyle.uz/images/file/rivibalosod.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/tewujukunap.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/88463893835.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/58163851952.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/xusodagaxonoboxorije.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/8456488430.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/rusimevofanuzewewukelamo.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/tudekowavazemefijifif.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/rokezeribubaxija.pdfIn PDF document text
    • https://wineart.online/userfiles/file/pasevejiz.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/66389109152.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614220632cde7---bakovewuzuz.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/95727382323.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/75529930301.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/tamefuzeparipenumudeforit.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/getuzujumojisetukiduto.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/78d58cf74c3fe34dd9c265abee058488/wilajipe.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/60267741401.pdfIn PDF document text
    • https://biocoils.com/img/file/80782881228.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/16556040183.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/dixeridivasize.pdfIn PDF document text
    • https://lordoptika.hu/files/files/nifazonatobiw.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_off0000c542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 10476 bytes
SHA-256: 78aea1a48039062e14a12235345fe1883a517d463989f664a96cfb6119a85d19
font_02_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 17200 bytes
SHA-256: 98cc855879c6e63bee25794b5f8d46ec584cec6994feb5a059e6291d72439d7b