Malicious PDF — malware analysis report

Static analysis result for SHA-256 20769ee55142aa68…

MALICIOUS

PDF

98.6 KB Created: 2021-07-08 09:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 114f240ab1f010f84c9017b8aa0355ea SHA-1: 5153af88e1df30e92e6d123ae875adc2037c2aa4 SHA-256: 20769ee55142aa68feb667a94bfd275a40409528916d0b25d840ed5a4e372856
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results for terms like 'portugal travel guide pdf free download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=portugal+travel+guide+pdf+free+download
    • http://robalton.es/Albums/images/file///93376991253.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d7c60384---6363955349.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc9508b3f---sizodavejaxuvixexebi.pdf
    • http://kiavysocina.cz/UserFiles/File/morimologuxerobupuvixi.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/50008226255.pdf
    • https://ev-owners.jp/userfiles//files/54064588885.pdf
    • http://doks-films.com/pcms/content/file/26759980716.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2992eb07---memosonaroximimot.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/17d232e20f51d8765b20acd49154ff02/zuzanoziriti.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b735089c805235ad4f4d4ed670d50714/39046509367.pdf
    • https://heuresromantiques.com/upload/files/760211195.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c87fd8152e5ffad8cf7d7ef98b4b3307/tonazowufexupog.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/jpv0oc015afrev8gj330qs4jb6/vigapenitekenel.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160800c433130d---kokime.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dfce26222---jepolofam.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eca019c273---xonibixuwodefagujadef.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c08118079f1---mupozalabesilame.pdf
    • http://poorclarescork.ie/images/76973192959.pdf
    • http://cuatudongsaigon.vn/uploads/files/42227298647.pdf
    • http://adabaskimerkezi.com/upload/file/81470490466.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b1f.bin
d21065d656380a067f05c51224326b3dbe1d0f9fae93b75197c9c14b24623567
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 10760 bytes
font_01_sfnt_off000133d9.bin
60bfd59cacd2f764ad5ca2e672e1c2caa346bc98de623422030fe5da07403017
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 19556 bytes
font_02_sfnt_off000164e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x164E8 16792 bytes