Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e916e7294d4cc39…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 08:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2a7cb49cecec50fdf60997555090f95 SHA-1: 6ff8956a715a845b2badee0cd436ba2680287480 SHA-256: 8e916e7294d4cc39563a377f1c0a23971a6396fb08613eaad73c7fddfd764a83
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute further payloads. No scripts were extracted, but the presence of external URIs and the nature of the link farm point towards a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=alien+shooter+android+cheats PDF link annotation
    • http://be-now.pl/userfiles/file/32968883669.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/62082832450.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/80902907574.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/pilinerodewoxizawusunawu.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/jokoromiseleka.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/kodexeviwoxawavar.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b21c74037b---82094271831.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/ginezozasedurob.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/gedigub.pdfIn PDF document text
    • https://coevent.ru/upload/files/fisavumokefagebumerubug.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/92607757743.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vinigavo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1f01f33b8532aabc334419dd5f7623b4/62743732247.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/dd131c37e4e79401ba46c570fca6b62c.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/45312924389.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/janif.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/55468243179.pdfIn PDF document text
    • https://efnnma.org/files/file/15230032116.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6d7cbed5eb2d2d782c2a7b1368a90261/bovejezil.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/71244656779.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/fumat.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/nanexenuninodo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16134614cb2573---4325649051.pdfIn PDF document text
    • 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_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 10448 bytes
SHA-256: 53e9eaa137420d50aafd72c2c2dce5fdb25a405072d89f4a673100edbddc970f
font_02_sfnt_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 18620 bytes
SHA-256: 6db35081f447273d515b36da90a67aa154c6432c3eee4242770e970274136d07

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