Malicious PDF — malware analysis report

Static analysis result for SHA-256 632263545e6f041e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 05:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 810f4041064ce9b76ebc18f37c0f8b1a SHA-1: 5c1ece80faccc94cb793f7082f78931c371be0c5 SHA-256: 632263545e6f041ec6ae20e4aab939e6b1463a79d30f9db2bb3e947a5ae044a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users by redirecting them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=church+history+eusebius+pdf PDF link annotation
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608385ec50ad1---6465107119.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/fesokonusotuvura.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/gurovavolon.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/q4n4v8f0pgsavoh25ms56iurml/gotowogafone.pdfIn PDF document text
    • http://qdjshg.com/files/file/viradagun.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/fufufedalasawuxod.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/fanutimoxedusufodor.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a7655da9a70c938f004af9eec0a5472/86708646449.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0988b09050---37123451601.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/liwalilavivumedebafigus.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/db15cab89ec5bd7a1bf99ca8490a12a0/79225698375.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ee895d8625e15cd72f77cb7222999be4/48869953777.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/16991541521.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gowibarobamanekuxuvozim.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa0002ae5e---jelaxomus.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/58154826352.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/nta2oebiufe2rvsfmjr16td92u/18287728883.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a4224946c---48609534471.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xulorozadolimepesasifiwo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160770e61bb925---gopexile.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/64284425260.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa52a9c7899---serak.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/24059671969.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/88625660170.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/lonujefesupasuretusu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 17464 bytes
SHA-256: 639cbf084a2831bf8ed8e9c2ae71a0ce0451e0b24f0a6f6bac45a7c3c3a807eb
font_01_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 10788 bytes
SHA-256: ab7dfbbc719d3c0ab3920509caa44c4249127e8782691e90805a4d9ca873e175
font_02_sfnt_off00012b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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