Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37de196d74e396c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-04 23:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b3ec7d56659e2a5115181c6263bc0868 SHA-1: 79da8f3e20008819c9fdb87ad73a5bcba57e72d6 SHA-256: f37de196d74e396cd490550ccbcaec24ce75318d1c64895b0e8054c07dcf3e96
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. This structure strongly suggests a link farm designed to lure users to potentially malicious sites, consistent with phishing or malware distribution campaigns. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://0-50.ru/userfiles/file/88480814027.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071b14630871---kunisuvilufafogo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ec76b45316260bc76c151781b1e35f10/17095572122.pdfIn PDF document text
    • http://teraval.cz/res/file/35266092246.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/71873655638.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d1685bc5a---xadotexapefixizar.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/tuguzimeditetivusovubuv.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/910204363bf55a7fe85b1efd284a3cb6/lomudiwobazuma.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/3420544404.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/86700739817.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/fuvumujuw.pdfIn PDF document text
    • http://airbaankhubon.com/userfiles/file/81129013266.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/94372073983.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/006oc16lvgkjeo7rdieu3ovud7/12640394162.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/8545026405.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098c06725c2f---12368625608.pdfIn PDF document text
    • http://rurisnet.org/images/file/pejorixakogifar.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c5849d6e8---66579724182.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/janofurejizuvekumivu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad34048bc2---suladudeboditek.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3e868d348197df631662131429d0fbf6/pakenafek.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/54dff4458e28d3ef9f96331d9e0af131/28261574710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+are+your+biggest+weaknesses+job+interviewPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 11064 bytes
SHA-256: 9f25b0c92848c6c2d40b90c2aca0cccd99cac220e7c83713729a7545f45b72b2
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 17108 bytes
SHA-256: 6cada4cac1f2d3e44ffb09a0f952891572e5c8590bd58b173f8edb8f85f86633
font_02_sfnt_off00012fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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