Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd93717e46888e8…

MALICIOUS

PDF

89.0 KB Created: 2021-07-22 00:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d229e12844ad3f37f560c9edd6145f69 SHA-1: dde85d37dd31d885a5180ccbc4b99e2f8334ac2b SHA-256: fbd93717e46888e8fa26640a99fc673589e54e06e8767438b7a5a74c8626471f
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with high-confidence heuristics indicating a compromised CMS upload link farm. Multiple URLs point to PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. The malformed stream length heuristic also indicates potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbddbd13bf---79626134734.pdf In PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c7cd4060d6803fba94969d2b8d0648d3/98687011974.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/h12c1pniquaplpel8dirs62lkc/55333855731.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd5e12c6c---35818100823.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/98415175997.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/36751881298.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2e1cada79---69502921271.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdcff48740---rimirivitaf.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf63c0579---vupanapobumema.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/16827137569.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/degobibajopufapilunum.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac18455dbf---52024350369.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/61572464657.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085825239c59---20247744169.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/tisamo.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/dukapotutusunina.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/57062a639cb2e7aba848e405f1782167/zifedutofilalapixepo.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/16099261331.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/dumug.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d797e27d53b9f7ba9ed2d4c7b1951a49/89360374429.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/10054418627.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/64294435504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=book+carrying+behaviour+reading+answersPDF 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_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 11156 bytes
SHA-256: 104dafb25c4c91b54d18b8853911442c2eccf51b9afa12b2e2925722a35c616a
font_01_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 17056 bytes
SHA-256: 3230b1fbb81cde7445ede42381298ae384cd6d8dd602a85ee8ed608cf4aeb387
font_02_sfnt_off00013d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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