Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a76ccfc534337a5…

MALICIOUS

PDF

104.3 KB Created: 2021-09-02 02:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b95cc348e1582168bc649531edf65caa SHA-1: ba5c4f03403658747e3ed2a9229a1d9f73d2b653 SHA-256: 9a76ccfc534337a51ea6d250d8297478a64d878017361b5e879e47b7c3de0565
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to phishing or malware download sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://valdhans.cz/userfiles/file/falibiruvoxopovuzusumeku.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfea5539a3c---66322632547.pdfIn PDF document text
    • http://ranch.pl/files/file/suwavafob.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/xoboxubozixoxaj.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/72644706994.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb4fb5a50---4289148413.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b6f22a09---zubolojutivubax.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210816_8A8B255FADBF36A8.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/91885869733.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c734e0a22---95564339444.pdfIn PDF document text
    • http://bscartridge.com/pic/wurexoluvunit.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/73725443597.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/eu7ukarlf8d2ao0finann0obkb/10081459449.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b4eca76f---93408844267.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/8363bf4316eec383cc059ecad811e4f3/17155859683.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b43cf7e8d5---81172380701.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/52261297204.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/30809eb90ad5267d8d2beaeb541856c1/batujezazuwavuvewoganebol.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lawudugu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2331c80f0d99c81aae50546cae3f5274/20835636386.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a818b37bc0---xekudafurevimirivana.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/20176564119.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hafnofs8cj3r1f33vvogkinbfv/mepazosagaso.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/zenurixotofidasatobazox.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/lokilubetotigogulobosuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lester+missions+investment+guidePDF 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_off0001310f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310F 19280 bytes
SHA-256: 6b40c94c055865091c512ec7dcdfabb1827f015e3cff689bdbd196975b2392aa
font_01_sfnt_off00016399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16399 10504 bytes
SHA-256: db10685cab393fd48e70f20193246b946e830d1cfabdabb233b97482ab1fa467
font_02_sfnt_off00017b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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