Malicious PDF — malware analysis report

Static analysis result for SHA-256 54903c23135a9474…

MALICIOUS

PDF

78.4 KB Created: 2021-07-14 07:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87562488669b936d2cb3810e2c0c8277 SHA-1: 539ceb4a293abf212824258a82e320da89ef8b3f SHA-256: 54903c23135a947467b465bb34be74646fbc796eb00640a20628690479884cdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage and disposable hosting, with numerous embedded URLs pointing to PDF files. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to lure users to external resources, likely for phishing or malware delivery.

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://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/2164371102.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d6885a972---61027752105.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210620_30494.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/zutuluw.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/93dh4ahc07let7c3mr6fog2pm0/53453476760.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4aebe131ab9b0b02719ad12af85b77e/3611842143.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/sduc0aq5gtku405m537v8ie1m1/70881882015.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd81f313a---70680783632.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021061517445773499.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/vozifegajuwufidoluselutuk.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/ronemi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff409d7bb3---92488386845.pdfIn PDF document text
    • https://adikkedua.com/contents//files/mixibulotapufosu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072e6e314152---21903408647.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ebf8162f---27936500467.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/18b341b22e55efc44913b32ffeda58e3/79892261955.pdfIn PDF document text
    • http://www.asslar.de/downloads/sovurugokujumuxe.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/a996htt6hgrdub36ai58fniibd/xoxudavenemukodogakan.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade2cf7631c---rovimiwuginegububiwa.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/zufupubujazabebezodavo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cc506a237---batuximezidawojijinodik.pdfIn PDF document text
    • http://allasclub.com/campannas/file/fowowudesovosewinonuxezal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=combine+like+terms+worksheet+answersPDF 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_off0000cdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 17060 bytes
SHA-256: 9706388f5cc619e9717cf2bad6960feb4c051b57f981027174e766a3a6eef73c
font_01_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 10720 bytes
SHA-256: b3b840d88e28e7e178678d2b7048dcdf65f21cc656ec8d4ecda2a1c04af02a2d
font_02_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1