Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad4cce53278dfd2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 22:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 773419f3fc75e54eda784d1c02dcfd9b SHA-1: ef649b94ee2d9aef71c8239faf0e34b3a9c9f413 SHA-256: 7ad4cce53278dfd25355c9ddb3f813f855d746cdc43008a55d99506be787baa8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=supernatural+season+1+episode+1+123movies PDF link annotation
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/bc0d5232baaec2aedb539931907e1e9c/54362043068.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/92951934377.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/96304025496.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/posoxotaxunutixuz.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/16038375846130179e4f0ad.pdfIn PDF document text
    • http://lovesenergy.com/file/luxulazurakalofitimeda.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/tajaxilesepukarimafidilit.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/5a2sdr4h5sm330od1vdnc8tsn4/gufitirepow.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/84522374286.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/jifonamajum.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/77a7645e670e4188289348396d4ae2e1/2306455099.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/dogutezivenepumoxezejuge.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/jewidawipolusutekuvow.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/32479887004.pdfIn PDF document text
    • http://cecev.com/stockages/files/88915058310.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/xexikiwupip.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/fexupukatew.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/giniwojipiriremaj.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/21371545617.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/28801193654.pdfIn PDF document text
    • http://belovosushi.ru/files/69831245038.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_off0000c45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45D 11140 bytes
SHA-256: f2668e20f309a3ed7bdbfff434b5ef172475c09d22794298f5f4aabe72b27fa0
font_01_sfnt_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 17316 bytes
SHA-256: 89a3306d0825657a46ba648f232f6c6322ba939b3f9017206847b410d5a6fa31