Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dfd89cd98b5130…

MALICIOUS

PDF

92.0 KB Created: 2021-08-19 17:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92c0da690182e43b3aa2f1b406f8e6bf SHA-1: f8c21789bc2ca3b6e1a605773bcd418cdb8da501 SHA-256: 71dfd89cd98b513015c86d9fafb06a5f775e88c5802c8e2eaa2f8f68058aee0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://www.channeloflove.com/ckfinder/userfiles/files/luzigawijas.pdf In PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/64818604638.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/5773942783.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f740df89f---61763552526.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/aa4a25949d148bc926ceb70d32e8930e/jekomaxifezuwejix.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/kugojidafudifenuwirule.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2bb82679785d5c9b38bd639987ae3103/67222795132.pdfIn PDF document text
    • https://x-software.cz/data/file/42521438374.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/14090498552.pdfIn PDF document text
    • http://dhf-china.com/d/files/wigibekir.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1e2bdb0bc---tekowibolefimebekezum.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/31660cc81cbf8f90f2f498e1383c6c90/vulimidilubazowavegefulu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7cde0f31067025415951ec83f6258d84/nitoruwajiv.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/gmk8j81v0467d8qmvl7auem13a/sizevozejanef.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd43ea80d---pibibom.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/64323210951.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/vojumujagibani.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb2c297897---87765174639.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/10442804133.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/rafalut.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/94291c88dff06afa49e5d5e420803f01/3405557516.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/29038801417.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09de2ef240---dafiz.pdfIn PDF document text
    • https://bamor.org/userfiles/file/vuposenosidigopan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ubqari+magazine+august+2019+pdf+free+downloadPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 11844 bytes
SHA-256: d90f0dbd2b2063ac136ddc10c930668a1d4e9f7230d513869e3abfc9c5d2d295
font_01_sfnt_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 19368 bytes
SHA-256: 645f66f89c03df115f120da41ffb7b4996f76f1c293897e288e034bf300448e5
font_03_sfnt_off00013c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 21552 bytes
SHA-256: 2902d6292e9c6d3f5dfd535e050e8f130e96a0ebbc5c84d92950c58beb03cce2

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