Malicious PDF — malware analysis report

Static analysis result for SHA-256 22479f08cb0a0d10…

MALICIOUS

PDF

94.9 KB Created: 2021-06-28 22:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7bd6e6272aeb1e8ee7ee86e79271d0b6 SHA-1: a803fc73b28f4046dfa6b1a51749ef59fd0044a3 SHA-256: 22479f08cb0a0d106d698a31a4768352f6b457f48ef0090bd5e13d79ef38d503
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm hosted on compromised WordPress sites suggests it is designed to redirect users to malicious or phishing content. The primary attack pattern involves leveraging these links to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://krisoc.ru/uplcv?utm_term=amc+channel+number+fios PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3a9839a8---53121507405.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/wuxusokamid.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfcd542bd---7298530319.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/pc1vepjlt0ml18u167d8ennfl7/68235618254.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/jusetajosenogelegovesuza.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/83315624950.pdfIn PDF document text
    • http://vodnik48.ru/content/file/71121181429.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ce24ea02---nenuv.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/kawijiganokaxuzotuduset.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bcdd33b7e---45181621904.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/42f5c59a826a83a53479d8d93e302c63/fudujivupaviraw.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ddcf794656a3212f5ce2d5cb604ba574/1509484908.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51a58533c036d710f310ecbe6ea1d2bb/xufepukasokojafuvol.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/91580337907.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a133f82ce7a6a3f18af05edc1680deea/vevokefanagexafulexanas.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c1d29d68---vaduwonigolexejomi.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/bemopolatodobujeluvujo.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/e03sddr2dmsl2u8g6r0nj81mtu/tisexoguwo.pdfIn PDF document text
    • http://houselandia.ru/files/24136457547.pdfIn PDF document text
    • https://amblamy.ee/upload/file/83456804636.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f7af9cd65---91538624323.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/358f15e6f96f4bfd5142a2027d3403b2/94068591311.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b090921b565c7e0795e11d1d7928ef69/vekejat.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7339f791b3c061e9d5a7647d4cfd5043/20923683054.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/635f2e4ee57d204fbbd71abf06e7d59f/11802467053.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ccc400fb---32227914499.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/26113452cb7886a392bd2f02d27ba237/jobaxex.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
font_00_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 16348 bytes
SHA-256: fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891
font_01_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 17940 bytes
SHA-256: 8f6654f631b09a6097041522607e6c72692d16adddf67a44787ed9f512bbe07a
font_02_sfnt_off00013d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15566 10724 bytes
SHA-256: 96dc315b6971e71a78bc1010b4600470e9470e671afe63a9e68855bc4a47fbdb

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