Malicious PDF — malware analysis report

Static analysis result for SHA-256 978f123bcd27b73c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-03 18:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8308c84c2cea7ccbefeab58f8899c3ce SHA-1: 9d02d34bad99d9a5b8bd1ecb85a84f247cb6ee5a SHA-256: 978f123bcd27b73c95fcfbe612d8f42488e8d53f2e7e983c243aca5ea86cbbcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting a link farm designed to distribute malware. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=fedex+international+air+waybill+blank+form+pdf', impersonate legitimate services to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=fedex+international+air+waybill+blank+form+pdf PDF link annotation
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/udebldn914nmbveik1lhbu421f/zuzidedupagegomono.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/12922261955.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa06465147---dotipedepexor.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1593a0b5ca---50599152360.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210608_DC7C31E76A2F4EC2.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/sifalat.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/67210461824.pdfIn PDF document text
    • https://landbar.com/upload/files/gubejemipov.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/9491877177.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/gifisomefoxafigo.pdfIn PDF document text
    • http://sparkpro.lv/content/file/93018361494.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc6116b4df---96707545727.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d336308d5948d32cdf8d6b5adcbcc9ec/verifi.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/74712740354.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/28973416358.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/paxugopadumepapugiz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609452b64ace6---21943271791.pdfIn PDF document text
    • http://turatabor.hu/media/repimezebulizodisev.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608794dbc6754---28441322133.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/35671730446.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6b21473b---9909502997.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/35898189988.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/49369899043.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_off0000bc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 11004 bytes
SHA-256: d5563a82e535273e3191c91893fb1ac9a49fea9fcf2cdce6d0f67226e68d8463
font_02_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 16600 bytes
SHA-256: 94f97e294d660f86b991cdf6010ab093918f253aca681e679d28f933eed740f2

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