Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb91f643d7bbff6…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 14:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07dcc7734a45c98f6ff1d1abbcf21b97 SHA-1: 54fc4d2b8b2d60843194545ae7c948c76ed93ae9 SHA-256: fcb91f643d7bbff6562dc752f05dc703c9f9de0a79c1fdc92bb227cef562996a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of 'utm_term' in one URL suggests an attempt at SEO manipulation or tracking, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=rang+de+full+movie+in+telugu+movierulz PDF link annotation
    • http://wdnederland.nl/file/nirewobavukozokipex.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/sonuxejapozixeta.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/92058101401.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161338c99196c3---98827952961.pdfIn PDF document text
    • https://www.confirmedtour.com/files/24408841589.pdfIn PDF document text
    • http://dsagco.com/Upload/file/26191790717.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/tilajafowitoseb.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/jodivubusotixovot.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/7320813262.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/26937445912.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/68061829668.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/vewujobelavuji.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/gifatip.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/91853992909.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338342340ca---pofoxobe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/d6sml5cu4r0mdf8mssrq3k3b5g/zerumilagusekiridetonoze.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/nakujowewezogezoziwuxu.pdfIn PDF document text
    • https://blugarden.eu/file/46331382932.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/mewojejinafiretixixip.pdfIn PDF document text
    • http://abwessex.com/uploads/files/65187338908.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/xoxif.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/natesuvize.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/bijikegijakikoxixovo.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_off0000c53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 10800 bytes
SHA-256: 1ef0c2dba2d0aaf22815cf3904d112d08baa4abecb6d2e597a5172463ab07e6d
font_02_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 16304 bytes
SHA-256: 1c783d6466e0197d20fd7ffaf1978c01815e176f6d77e9e6c20d2aa54780d353