Malicious PDF — malware analysis report

Static analysis result for SHA-256 056e5fc25457d9e7…

MALICIOUS

PDF

81.2 KB Created: 2021-10-05 09:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 99018a296f2fd5e682bad10867e28f96 SHA-1: 0cd6772c289e04e569adca38ddae47c3020b6a7c SHA-256: 056e5fc25457d9e77ffc4dd2252bd9727b59a6331c910eda5bfa3e3f93d31fab
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mbzgogo.xyz/web/img/podborky/files/zupawanomipilesojexosigap.pdf In PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/42921387600.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0430bbbc9---65382689355.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/kokasomivoxoruvop.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/seveguwuvejobilisaj.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161566b2d3cb06---nodufetifazazixikepezowe.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/91291894247.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/79148366543.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/221822597139.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/divexiwopav.pdfIn PDF document text
    • http://robedecreateur.com/img/files/74471799082.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/74153718155.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5bd0af14---zokire.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/76999164551.pdfIn PDF document text
    • http://chinalabware.net/d/files/kelojixebafo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144345a14379---82520637664.pdfIn PDF document text
    • http://sentai.cc/data/file/20210911_084259_997.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/57447245581.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/83819475660.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614032f3dbd40---87949079717.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/49815983868.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/23051504405.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/72002861045.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/21806066426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=design+of+steel+and+rcc+structure+mcq+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_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 17944 bytes
SHA-256: 33b5ea6c14838a71a73ec8ca41a6d034ba1a53b15fb6723bd35aa980c04ea74f
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 11212 bytes
SHA-256: 137f6e0f60927e8d848889a0839fa61d26f48ad6e5aad34e39e3775b10c8b8f3

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