Malicious PDF — malware analysis report

Static analysis result for SHA-256 8022c8aedcc8cb03…

MALICIOUS

PDF

81.8 KB Created: 2021-08-13 16:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1fefe2bde88d551ca34f35fffb399a2 SHA-1: bac40581d2430ffa743bfa2ac0a4436a52364396 SHA-256: 8022c8aedcc8cb03e701a9810e45d769b5cb0ddb377a73d6c35902fcb3cacecc
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

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.
  • 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
  • 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=minecraft+mods+download+unblocked+at+school PDF link annotation
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/528566abc7f6d66031ab6356765b2b39/55530141782.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0f0f0b8c---44377517317.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6ab658aa0---fuserevilepezafiw.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/959d59262ce57db2756dce5be0e442e8/tolabegakemejumu.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/50743469443.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/mabubepigabevi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7fcbbec52---folajajoxurivaxabeb.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5578e9ceb---naranat.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160956b610ac77---14246618354.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609e076e42f74---98583859202.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7f856f93df5896934f8105d4877a8292/51447441969.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ce050ec1---65929800061.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca24cbe21---71113577666.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/25ba6f7b43461762fff92d5629b77cc3/75195234383.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/1755593159.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/10030976272.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f728879291---xibinajasoru.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/nufiwezamivalanuwof.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2537b37e---42741816089.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/be71061d26f22e83f946ce1be6bde26c/92709627440.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a85c322027ce663f8b74eb6bc6b23c70/migiwejatobufures.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/59426954009.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/oo978e0l113ejbemmp295kpvbe/rijinajoris.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/12071814247.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0ddfa9d58---nukefelajabokosimusuvu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 16900 bytes
SHA-256: 3338b3540f97ee5364cacfe51992f9be0ef07373b0018763fedd511716bb2a1a
font_01_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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