Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e92d1208ad9a725…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 13:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c37c7f2e3633a26ef13d560927a02cb5 SHA-1: 8df97ad722e95c89e1c7d29ce2afbf4810068b7c SHA-256: 8e92d1208ad9a725583ef07a0bf789e40e2c37959fcbfe1cdc9f021898b47b02
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains numerous links to compromised WordPress uploads and disposable hosting, suggesting an attempt to host malicious files. The presence of a 'download button' lure and explicit password instructions for an archive further supports a social engineering attack aimed at tricking users into downloading and decrypting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://archism.ru/uplcv?utm_term=call+of+duty+black+ops+psp+iso+download PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f4617aaff---binuwusenulofezikof.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/nulagorepejodebupogipi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-14/20210614152629770464.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/lasaxevuvoj.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/80102217246.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210809145452.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/42217004769.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa9661802---55167188218.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/60314861062.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/negujegi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c659371fe---bakowipedoka.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/fuximud.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a394b739e76---xomumeta.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fikuxolevuzofonapinukez.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3e8b2a98669bfe9e68a41094d98ea0e3/kutowewedizaxinajojan.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/rakupizimax.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/e7c7fdd2acd1cb1d7797c6159634a5a7/4743460126.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0d80647d4e426f050255674524c3d4b6/sibogabexewakup.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/900083536f38b1ac2691bbcbf61d9ecb/91121091243.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/pofetizubemez.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6903a94a4d---40203916139.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/70639019965.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/64517082817.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/12018114754.pdfIn 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://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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 19032 bytes
SHA-256: 16c1bebc9749476b32ff838b5258c40d88295aba0826f92854c9a4d35b16801f
font_01_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 10944 bytes
SHA-256: 0351970c16b6d2fd1040282fea8e944a4377772c5a0ad9d18e37820e340bf54b
font_02_sfnt_off000134a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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