Malicious PDF — malware analysis report

Static analysis result for SHA-256 625fa96b1f201d16…

MALICIOUS

PDF

100.5 KB Created: 2021-09-03 07:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68038a98c1b541af05087b9b3216b0f5 SHA-1: 2b2b9c42aa46e63c64206a74ba77deed1cdfbead SHA-256: 625fa96b1f201d165b5bed71213d358f293bbe8fb46c18b6efff6564ef1ee6ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farm characteristics suggests it's used for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://casalindasbakery.com/ckfinder/userfiles/files/47223035438.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ef2a99e90ec1f84395aca69803f04ca4/57294142868.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a31bde2c3ea---76898549103.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec938b2c7---wozire.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/25943870867.pdfIn PDF document text
    • http://impactmediaresources.com/userfiles/file/84587516589.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/mibisokazifudurikalat.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/juvobenosoziz.pdfIn PDF document text
    • https://qkon.ca/images/file/72625538167.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608135cf1c46b---vudikan.pdfIn PDF document text
    • https://amblamy.ee/upload/file/ropotepezagax.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ugi84vlgn4uvu4it795o3io7sj/449407577.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/60482715682.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/fufewezo.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/8760022946.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/gijomuwukexazedawen.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/91186457246.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/51635491478.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/14404447147.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a32ec4de---kijenuwujo.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/xebujinasedij.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/2kmef2bae48l041qlnlklg95on/41050195386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=define+communication+barriers+pdfPDF 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_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 18520 bytes
SHA-256: f0d74b1ecb045f09dad7d4e90ec1f11f30dbbafdf3dd4aaf94dd67044eee8ba7
font_01_sfnt_off00015356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15356 10976 bytes
SHA-256: b949b41023e738a1cf0eb2d222f2f68b54fa2432057384fa7c12db97aa0532c8
font_02_sfnt_off00016c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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