Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cf98651e344587…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 20:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97d2a4087b09247473b172866b1b01b7 SHA-1: f1072a6671868093db7bc6eeae373a76ef315c8a SHA-256: a9cf98651e344587906a2c91b1964792808e12c13e761f9bfd94b4ebeb36e58b
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://emenu.hu/editor_up/penexapibivumij.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf997babc---24717094586.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/lozemezojewubufirugiwedi.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/30674678453.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3748f13fbdf1df692ab7ff9c429bdd44/42010969170.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/6691513274.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/44164445292.pdfIn PDF document text
    • https://nistd.in/userfiles/file/fisudiwetesobaxi.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/vigonaxab.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/xitebav.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/jufoturipu.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/78428277972.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/30629667545.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/rinosinitesipuwis.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/60208331408.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/9639018474.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/batijodifem.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/9456346288.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/8380803076.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe12769b95---gofigeziwewazuzax.pdfIn PDF document text
    • http://www.bash.cl/media/file/lomafi.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210904_AFA93BAFB4D76A8C.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=msts+in+androidPDF 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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 17296 bytes
SHA-256: 747cb860694696c4154e06f0635425d1aac38a66e4c238bb538aa3043a5d3fed
font_01_sfnt_off00011796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 10056 bytes
SHA-256: 7adaaa5e2685c280bbefdc40fea76af92404a92f4101c318e34a78cf9c7fce63
font_02_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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