Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afd9f1f9172c70b…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 16:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 75ef755e312c7f8f4d7dabca69b2d85f SHA-1: a776e1a89b6f5ce393c71fa5a6c885524cf0a8c2 SHA-256: 1afd9f1f9172c70ba1d498401dc4950733c278643271119988fb529eb0b636c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/61ed4fbc21da303a6abb64948bfdf020/kabuki.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/a2efc989981e6e5019433624d7ca9bec/86630653152.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/qnl3ksi9i97tevmns0p9oohtr6/95692611259.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/ab807aeece8116ecbecaa6862e46c0ba/jefisisefexoxagudexadel.pdfIn PDF document text
    • http://clarasonic.com/upload/file/1669223953.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/18424571592.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/69d178f5561b6e170b0965101627c1a8/xesebumopiwawurudigobiza.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/51719118367.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/39739964938.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/57165803197.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607235d754ebb---15822393528.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1ef9ca2a3---1363641452.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a30421117---30997861143.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5301227eeafc051cc52fd70d75122c85/kalalolo.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/13740983179.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f59a99aa15b914a562677eee8cf7e9d6/rukorawizitedebibovaze.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/29809404200.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/m9j7tc069g7jqk9ao5vlbe0hp2/pavileragep.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/lodorodajilo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c07efb8947c---nijevovoweluxefadud.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gdv4q8udaro0p69s5t15ue1b8p/modezadudoguv.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/suzaxijodo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bj6agsbaqt3aepvrhvte1n0mmn/82301617744.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd4251fcf---95394249593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=can+mice+climb+out+of+a+5+gallon+bucketPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 10908 bytes
SHA-256: 60a2a14b4b3073e97f4b70d5c29db721531a597b044d3451540f0859a94eb20e
font_02_sfnt_off00012268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 16836 bytes
SHA-256: 33a1eb45949b86903d6f54abf4bfadeffbc41ae1adb55fb4b65eb40185edb5bb

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