Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e7b7a951aecfdf…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 10:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa9c3f2a3eda22e1b344b1a18f599534 SHA-1: f6153dfee7eb1ff475ed5e5613cd41f07d4d6530 SHA-256: 74e7b7a951aecfdfedd21c353f992e3c6264ac791699989c2f563680b476cb89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves luring the user to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=addend+and+sum+worksheet PDF link annotation
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/vumub.pdfIn PDF document text
    • http://promador.pl/userfiles/file/sevefiferapag.pdfIn PDF document text
    • http://amandamaitland.com/images/file/dogazadojexufodapiki.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/90938999662.pdfIn PDF document text
    • http://texmet.pl/userimages/file/9391044235.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a936d63375e2841f26c0ba66edd7aa74/53698276414.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/72359275677.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/feminuropevem.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/66047160196.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2f4b1c023c1ff719d4d89a1bf4339007/66327053108.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d92cacd274d---koniridugesifofuze.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a93b2d5ffe0---kifekuvuziwe.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/gajogofedijigidubopoji.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/25202323693.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/43841891128.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b2b0b00f981236cca2b087aefad37c7f/28511568965.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/a4dpqnf719btc5s117fe9lv8n5/13820613704.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fea9b8e222c651b90c35b07ee0cc04c5/xedufewebexozefabu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24e97d76b5---kejunulisikidonijaz.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/lofotep.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/xitofuzoguxiforo.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_006_off000111fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x111FC 18444 bytes
SHA-256: b337b4398d074a3f922aa3f2ed88d25d015c590ef9b9cb9a7bb13651668ea6d2
font_00_sfnt_off0000b82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82F 16136 bytes
SHA-256: 5752e58198ad87350eb48d5d01896d32582f50af63d7aa0016931d27f19307e7
font_01_sfnt_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 10636 bytes
SHA-256: 599692f0b7e434c3f02ed0c3a549fdebdb2a444db735cf4a41428c15e9f4d920
font_02_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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