Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6746b5705b2ffe4…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 22:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61cfdcddf9dafeb5389248baa889a562 SHA-1: a8a3cdbb05071d10c85f84786b8f3087cdea7e37 SHA-256: b6746b5705b2ffe4962f8a54a370678f805a4fb7f58fab7d9af5c847dda1b338
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to lead users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the ultimate destination or to track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54584e26e---melopozamimadidugule.pdf
    • http://sl-light.ru/design/img/upload/file/zelofi.pdf
    • http://www.jindatunnel.com/up_files/file/80030658137.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/c8gou2cd3fuuekkapv4drdvvb0/38779569128.pdf
    • http://dotacjedlaoze.pl/userfiles/file/fapivexofikorotunoj.pdf
    • https://its-bulgaria.bg/files/file/25723371128.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/599c2778503cd3f6486e19e31e22b71e/woganuzijuvupoxaruzemagej.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9e886044949191d4e63eda6a9ed4549f/71080226907.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/610f48082fa5b8e286e6de99fa994db7/73053622276.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2139a14732---pozapid.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/4hk9iq4b2l7et7i2bm33ne7hnj/jizegerilotavofol.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0c1619eca---93912482962.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/09d003d4431f8fc41ec30c6d38f5560f/30484980269.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d70ef9acc3a---pisisebiruw.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9c746e7c98817b5469ef58e6c8b30fd9/18785032008.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160967fd84b5bb---14592977965.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5ed4f629---rizajaxirurarobupazugeba.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-11/20210511164931179307.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a69b7ebc2---4413289314.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bae8921f4---wiwupadazadategaw.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16093de206e416---xotarunix.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e65072ab---9164163933.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb87ce76c6---zizunibuzejobatirube.pdf
    • http://humanitool.ru/userfiles/file/sasifaminukofaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=quiz+for+present+simple+and+present+continuous
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e991.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 16792 bytes
font_01_sfnt_off000101a8.bin
f19a14d7655c430bc1ad0a7b63fa2975f832cb1b54d1db22e4335175e111f7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 11000 bytes
font_02_sfnt_off00011b4a.bin
d252021710d7397f155ccd1dac0492562dcd54f59e37d3d04b5aa2c2b31195cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 17516 bytes

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