Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02cd2259b80c510…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 21:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a70597074722fb443db1b60a36a3698d SHA-1: f7bebee3d140f530810c98d74759b4c92e1de60d SHA-256: b02cd2259b80c510a842c034b62121a58414bdaf9b9d539c0e124c1e5eda3d5a
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads, suggesting it's designed to exploit vulnerabilities or trick users into downloading further payloads. The presence of a 'download button' lure reinforces the phishing or social engineering aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7c44d69bb88553f856aad5202a65e882/migitemowe.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff40bad62e---tegomoluvoj.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b82f60fa71---48670442398.pdfIn PDF document text
    • http://hongdacable.com/d/files/24030825866.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c985baf0---62787379083.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/46891497909.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/03711e9e928b4cd961ecc91c1cc53fd9/suxebesumajagut.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/xidegisugexuwexigu.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/xabexebuwewerugaguviwanez.pdfIn PDF document text
    • http://halmar.info/userfiles/file/fikapurekavowopupenonawe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/29b4be46053d4c4643bce904f7e07ec7/miroxoduzokexiwamowegew.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/goditiwek.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/adc7807b634b635b1be5d4bfa25ec845/53894800082.pdfIn PDF document text
    • http://glastergroup.ru/userfiles/file/22657133403.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/92493136207.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/balefonaxumi.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/momoxigasadunipodoj.pdfIn PDF document text
    • http://oodow.cn/upload/file/210621141846684447xynoj9tyszg2.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/kirokel.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/13953523911.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a770113f2ca098963f2a147915bd7ab5/litanoxurisofanakosag.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdfc1e2288---sawojavenurizoronajomup.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609374da491a2---wuxatobapapepanilemawuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=save+ppt+as+pdf+with+commentsPDF 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_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 10968 bytes
SHA-256: e67c799657c507686273f5f211a0693b70fb33e959f5c3976d27132411f1831d
font_02_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 18856 bytes
SHA-256: 4e4ffd895881920d05423f0c6d0082c11603e6ef0653fb2456b10cf4e1959296

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