Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fc8cea29abd1f7…

MALICIOUS

PDF

89.3 KB Created: 2021-08-06 08:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66cc56fe2ff85b524472df21306036be SHA-1: d95feb9c5b9387bbdbb4ba62ad70f6479807a0c0 SHA-256: 74fc8cea29abd1f7399f79998c34cd7c00f7453255d850d74ba50e31bcf5d595
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Antivirus Software Disabled

The file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate social engineering tactics, including instructions to disable security software and execute commands, consistent with ClickFix attacks. The document also contains numerous links, some pointing to compromised CMS uploads, suggesting it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/b0v941t993maeu0k6jg8ru5pc7/wewodufo.pdf In PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9a2a81eac---26345916232.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f01f034ab---wagobisofobuxof.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1ai3gl6kj7itlcv9epqfr2htj2/lupugavagobukotifasupu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d9237e0018362bf9c6563503fc3b0021/62701788924.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210701012255.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/73158056220.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/100755492346.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pvgirf48hcof00jugb1lndqn1h/budowimoxebatobafe.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/66654264740.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/o682cafk9f9iufuaa4q7tsjs6l/wuwixudijikagu.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10136801340.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/dvhv33410u818h3rbo3qt7vj4u/35644416002.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210719_194126.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fdf05f358---xatur.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/zizamerade.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/nutovuwuselefami.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a53d21fb---jofaligaxukegazajan.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/nikutinumizuzojuninuge.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/detuxedudekerul.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/eeba53e9ececec22b1424132b6263724/kigenotatatafo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b42eeedf574---vevofewi.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/dotimusorir.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/68485808626.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/37293671685.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/tajir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=is+bluestacks+android+emulator+safePDF 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_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 17044 bytes
SHA-256: 43264321999a0be80ffb4c18485ecd53fe1d2eb1e0e76860ddeb05625a61ab53
font_02_sfnt_off00013d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D54 10920 bytes
SHA-256: b39bcee202ab00abbd68277702b3dc2fef48940c51660426c5967c895c5fddac

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