Malicious PDF — malware analysis report

Static analysis result for SHA-256 db30e52ee5312f89…

MALICIOUS

PDF

136.9 KB Created: 2021-07-20 21:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0401dc09ae959e3a4d1d55d43b07abd7 SHA-1: 702a00c93fe402b1f0c2fb0c62df8b4717174f9c SHA-256: db30e52ee5312f895c739b48d9ed170096b0d1e05f95d85f5349f0a591d50918
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://iohrp.org/f_files/files/61116981528.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/af79c98a9b9a4b927a6b61788830d1e8/69281571598.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607449224290f---57176328412.pdf
    • http://konsultacjenaukowe.eu/Upload/file/vepozarelomejebonut.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20210710_88AA6C65A199D39A.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098743c4aa53---nurejo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bae95592a---67937041892.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b85129a2e63---dakidaluvozuvezafiga.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902c419b6f4---pupivila.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/wegib.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d935ca82---92783509606.pdf
    • https://juhaszautovill.hu/userfiles/file/74524091327.pdf
    • http://secureyun.cn/uploadfile/file///2021071304451681.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad6885bc6---96242936961.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vet25hk2n2ht38j4fhpo617gb7/98056995715.pdf
    • https://ottenburger.com/userfiles/file/39489922780.pdf
    • http://capitaldanceacademy.com/userfiles/files/66051035093.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c2baa4da88b---zipefokuwiwesodesizom.pdf
    • https://weyergans-hcc.lv/userfiles/file/82102244746.pdf
    • http://akicgiyim.com/userfiles/file/pisoxemajedufekulag.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16088775dcf4b6---fixumames.pdf
    • http://automotiveenergy.cz/userfiles/file/budexi.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/439d67322e55deb531280bde1fd47629/43616730362.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=speech+and+phenomena+and+other+essays+on+husserl%27s+theory+of+signs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b476.bin
f014dcb46507ba5b1ca22f0feb53ca8e8185f7db582a5d46c585e03bcd07c4fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B476 17788 bytes
font_01_sfnt_off0001e2b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2B9 16792 bytes
font_02_sfnt_off0001fad0.bin
4ccfe9bf242ce5149a13a1ec16d3208a72095999d2a1ca9dfd44609bd29e4b74
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAD0 11392 bytes