Malicious PDF — malware analysis report

Static analysis result for SHA-256 934402f7d46b2edf…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 23:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da91bfc4c1fbad8462d40d6e13a61ab6 SHA-1: 95ced0b244d5e8dc98b1087d934d9518ae249f9f SHA-256: 934402f7d46b2edf989166be526538ee0304c729afa84a309d8fd33927f007ed
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may be designed to trick users into revealing sensitive recovery information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://philabc.ru/uplcv?utm_term=x+player+3d+pro+apk PDF link annotation
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99497d544---vefomisadevulirixo.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/70067764389.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/vumuxis.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-7/20210907025821991296.pdfIn PDF document text
    • http://marymo.ru/uploads/files/47224276525.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/xovefifogofotunekavu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fecf3b361a0c17e1dc784e279b63320c/23468459042.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021911836374379.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090310445873499.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/zipuxagagejotozusowe.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c36d67d5---66417637429.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/levaguji.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/bijivuvuruzavagor.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/tebubojinekekakota.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/72094127084.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/12276349988.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xirazozunefefopupudat.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da426b9ce---74023796618.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109060654418801849y1ny5.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/96329357869.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/25337563448.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/47008929959.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/lasatofutalufeduwug.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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 10308 bytes
SHA-256: 05def48afed3a86a0d983e96b8d6090c44cfaf24290ba04261fa045ed6e5bf8b
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 17276 bytes
SHA-256: b3f49aed9a9909cafdf1f9dc3972d0e252f44157e9a7c0b41e653c3f3c3623ce
font_02_sfnt_off00011f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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