Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48950e0e1cba32c…

MALICIOUS

PDF

105.4 KB Created: 2021-09-05 01:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98ecaf32c9c5fb1749bf31f732133865 SHA-1: cf7c449454325c2c57481dc0ae51f814cb26f8b7 SHA-256: f48950e0e1cba32c15bcba4f255bde1711cbde9eac2dc50e0e21926d4a4a7b79
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://chcial.ru/uplcv?utm_term=c%E1%BA%AFt+pdf+tr%E1%BB%B1c+tuy%E1%BA%BFn PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084642936fbb---tufopexa.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fbee6fd89f4---59787212380.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4fa3bacb33b9ec172c9999d902dca53b/jizuxupowekeru.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078837d29f9a---vedozexoxulami.pdfIn PDF document text
    • http://berbun.com/user_img/file/bimuz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cedec1af351---61836501749.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1954a1995a16854c18b87860334d88eb/vojumupibivipixefib.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/35925840642.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/kirukogus.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06bc8e03a---sexevelijedojebolufike.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/wozonaxeraxoveren.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc32f87857---kuretapikawekule.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d128643227---lijoravedadudofupajixu.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/18823524899.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71191693820.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210616185359.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/9354928264.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/58f1597a38ebe2bae0cb9f1cf16a397f/xogusixuzolu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f26787e2c---fozaroremejavarevat.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/82017706416.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/miwobaxoselopudufi.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/bonivefonoro.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/84261426146.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 17532 bytes
SHA-256: 9d26f11ae4d0aaf1ea1f7c3405bdbb1e7420c4c16126c4c81e2c5d2ac3bd2f66
font_01_sfnt_off0001159b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 10772 bytes
SHA-256: a6d397ea109f922696853197f20c936137050154523fe10d3633ebaeb61f4f75
font_02_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 2128 bytes
SHA-256: 57e0292be3dae69396d24eeb93d5f695b45ab015893fb967353d758df89f1456
font_03_sfnt_off000137ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 28176 bytes
SHA-256: 45bdca53f143e152dcda592ea51684d597624e4696b33bf95bd8e18cc2cc60d4
font_04_sfnt_off00017ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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