Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c7ec4450a71a44…

MALICIOUS

PDF

81.5 KB Created: 2021-07-25 22:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79aa5fb691f0a694b8fa9b5df9dbac61 SHA-1: c50aa80648a290caa7ab8b4244afbb545e4d39d3 SHA-256: 42c7ec4450a71a446aad226be8d493054fadf856d4fc263d62c8a98a24d82733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a tactic to host and distribute further malicious content. The presence of multiple distinct hosts and link farms indicates a coordinated effort to obscure the true origin and purpose of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ce8b6efe2---69996050092.pdf In PDF document text
    • https://mtcmultipack.com/uploads/files/99108060733.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/319d7928257fdcce66114671a3b61909/fimokelu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1dc446a53---fafamapuwofi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd45b9f4ac---31249653874.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075704b386b9---zofuzifawoborijajugupis.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/82910495693.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce499b63a---11269953584.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/9892339993.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/zipegunomawufal.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/rahbecvevqt827514av4hmg8i2/zomunabir.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cbe239b53---14787518206.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ur73pb4s0ubcdvfojhjp8fsjvp/2561886502.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4837d818c---48551387708.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8bfa4e36---bosorapovinagidawenipe.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a393e728026---pigukaletabivobu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/788cdfee055aeb33ac5d7c4802edfdb5/najosudezamisenamukimijo.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/pavewariliro.pdfIn PDF document text
    • https://irantruck.ir/data/file/19863672565.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/71202762553.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/17100397628.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/99150891375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ethiopian+music+download+free+mp3PDF 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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 16980 bytes
SHA-256: e49ae349ceabd7105498a0580193799ebc68b2100b4a1654279b52f1a779b91a
font_01_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 11224 bytes
SHA-256: 07593b5bb39980283657bba0ca5848a9e8e328727d22f45b80909201fc801dce
font_02_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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