Malicious PDF — malware analysis report

Static analysis result for SHA-256 3595699c2c1da53f…

MALICIOUS

PDF

83.3 KB Created: 2021-06-18 02:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: df60b5f0454fc4ecc149d23c7087c6f8 SHA-1: b6350e2319952a3163381236598cf58f614ed224 SHA-256: 3595699c2c1da53f10d49bc4cdbb8e948888c9b4824f0c3fb4af3f03b99174b7
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the PDF structure and URL findings point to a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=roblox+prison+life+aimbot PDF link annotation
    • https://bitree.com/ckfinder/userfiles/files/foluwifesevulutedibeluf.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9fde53af3a85dc6a8213b841c199b697/seseforalevab.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092042c6322e---jipuvafujefararigumexokak.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c5786ae7458---1763131218.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a716bae2998---6850914010.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7420e81a---sokopofukorivoxixulun.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/fovadoravufezabodewiluxi.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/43023153393.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/83697621065.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3af1bb408---24002892833.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/vudumotetilufixafebepat.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a01eb9ad7f1---ganulef.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ef72a29c230dac2c894ed27f06d9f7f7/70416642040.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/885u932gtlfjne59o1b65014r4/27790209787.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e6cc7e4b---99300358529.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdd16beb7---93681070943.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0532867d---lavanogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A8 5408 bytes
SHA-256: 356dc41aa4abe691e6863955047b7efb53eea28ff1bf15afadd6376bcc787dbf
font_01_sfnt_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 5260 bytes
SHA-256: 14fed62b84d284624148dab3e75a3b01b159410664fc924d0be232cb7012939e
font_02_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 3460 bytes
SHA-256: 6fba87d7086edadf2e6ab49f2733928c9a1708d476522b4a325a6a635daf4441
font_03_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 12984 bytes
SHA-256: 00add0db4ded63e77864562e729bbb5f6bfa81c9ea032bab7c045221840e025b
font_04_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 16736 bytes
SHA-256: 9dbc2304723fd5ba8a88d30a325e7576402455b65a4e3eb13628a7d17b83aa44

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