Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d30f19fa184e81c…

MALICIOUS

PDF

98.3 KB Created: 2021-07-07 03:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c1f2f1ca8531a9d0be551ed91dd490ec SHA-1: 963dad100126d3c994cd6acafa96bc7963ee3ce0 SHA-256: 4d30f19fa184e81c40e710f87ac4f9f14b9725f5cac7726709f5439fcb56e6f1
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely to download further malicious content. The presence of urgency and password-protected archive lures further supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/gosedasapenopej.pdf In PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085607b16fd7---bawejidusaruvewirit.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160704193226c3---35129911766.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/16992203589.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d67832e57c24a5a95a34264ab68068ed/17742095744.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c72656af---jovozozakurozuz.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609074a98788e---97082611980.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/30587639048.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079125ddf963---sigifadeduguti.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19dfebe2d2---vuvawodululavoxanajaralu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/31259757654.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/21534499270.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4e194fe7---tepino.pdfIn PDF document text
    • http://18554080.com/userfiles/file/18501884399.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/54375905472.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/48f53deea7b7a87b343309d94ff756c1/rusumijawikokesukozoxen.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210614042732530483.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e93aa415204739159073905c3f605fab/biderimosegen.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7eb138e59552ab568fab6304cb507a82/janovalexuz.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/buluxamopakilatowebar.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad256d54066---rifuviramujidizewasogevab.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6d8875d6267142667d16f9268f0a48f8/52377376205.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d6a6437041a1b8e5d989d7f7c34e17ff/54187521088.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160963afb10051---monefotiwiwudopefoginude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+rated+gynaecologist+near+mePDF 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_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A2 16668 bytes
SHA-256: a142c8fa3a1fe2c4a505632b98dde293ccf1b5a6fba0733623dd917badfbbe94
font_02_sfnt_off00016302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16302 10880 bytes
SHA-256: 46468047aecb34325b1f91ed9154b08c2370b1f3480abfeaef99e13c15c0b7a3

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