Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46bb52dec2290d1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-10 18:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d646feb3026007ff8e973bf83657a816 SHA-1: 83acfb192db4227f510a63c85f2886836c9ad5d8 SHA-256: e46bb52dec2290d1723c57f73002a2f53e433c69b32e68e050accc185682e811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of links, many pointing to compromised WordPress upload storage and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. No scripts were extracted, but the structure suggests it's designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://songod.vn/uploads/image/files/76364492700.pdf In PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36259790920.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/86c864eb76c4ad910d9044df6e4bc56d/78645335236.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/dituboziwufafa.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b040f8ab4d---jafesubikemojamuridoris.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021982349151759.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/filerugowomiridegemetemu.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/53632313504.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/libasegoluvemok.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/58400214800.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138211bbabf2---jumevagul.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/40268280178.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/nosopevobif.pdfIn PDF document text
    • https://kratky.eu/files/file/vipinesinazanuwegotexone.pdfIn PDF document text
    • https://mimpishio.com/contents/files/67425694638.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/82557557865.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/webuveburutud.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/85362226672.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/38946028099.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/migewutigewuwele.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/56377890421.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/82406558131.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24b15e405---rapomasotiguxosowaze.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/jowositapukaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=call+recorder+in+mi+phonePDF 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_off0000b7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 16532 bytes
SHA-256: 541ef5b28be8447f717ffb81b6a31eb83c69f97082ff096209cb3c7782384c0c
font_02_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 10544 bytes
SHA-256: 3c621368f5824af940a645a82eca4baa088d4c56bfa091e27160f975cb7aaff5