Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b43bc7ed0ad791…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 17:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: afa1788e6681769044b36d8fd8638d36 SHA-1: fe23f560246d9985d2ca58befdd5af306412d9fe SHA-256: 07b43bc7ed0ad791b21939dc0cd6444e8496945add3898c2ef0d7566bbdd044a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=reaching+and+teaching+students+in+poverty+pdf PDF link annotation
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774def62a2e---mepolobifovojata.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608658d2c96bd---baditiwewizowu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc517cb2f---22676186213.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/92379290951.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610912c67e9d5---52747255569.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/48536629108.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/kijowepalediwutow.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160871eadb1b9a---nelubovuwemegej.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/96oc2vkpn0tj5jc9p1eq4rtij5/fojatuwor.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/cukf56ir6c4nddvp1q9bleo3r7/50926679671.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/pafajimomebuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1070030870---jakajexutenutetuki.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/11796259721.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121731abe4d8---rivefefazoroduzofaj.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/winalow.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/21801347120.pdfIn PDF document text
    • http://ligneus.hu/upload/file/44133409932.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/eokqmuogb2r12sl16phel8i5u7/32799786156.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/41466243538.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/rumabi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b284c0734---80174040634.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/85146e69bcfcab426ddbab779ca9b681/kexezatolawepononiv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c1f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC1F6 17336 bytes
SHA-256: 5b1ece2858138f7a79a29bd681241d196e070bce6b52f93084cc65376dc93dab
font_01_sfnt_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 16216 bytes
SHA-256: e1d6b0b9742e39867426cc28c8d2d5d5c3616300d49ab24482b3b0c0f6bead67
font_03_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 11180 bytes
SHA-256: 179373158594452a83cbcc61b2e2a2543fa001be78a51fe4aeeb40d1acf89b2f

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