Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16c203f432e73b5…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 11:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0253b2ef590e919de2e3731bc725a3f9 SHA-1: f193fb12fd25d7d506845421990bcbbc6f3c9d80 SHA-256: e16c203f432e73b501a00e8e6a48bdcea24fa270e39a048d1ec20a47b362b216
196 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, many of which point to compromised WordPress upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a secondary payload. The primary attack vector appears to be spearphishing attachment, leading to exploitation for client execution.

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rh-h1tapi-turbo.com/contents/files/14641956799.pdf In PDF document text
    • http://getem.eu/files/file/zemagitafuzixorasetavu.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210907211046.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/68328073173.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/menupopu.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/satuv.pdfIn PDF document text
    • http://licausi.it/userfiles/files/lexux.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/42856680026.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/87cfcf3f85f2c27c1696d05ab5697bc3/46558776858.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/85987544986.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/19103564093.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/votiniliforibupime.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109120035055012.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/vibowujot.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614544530a2de---90606613238.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/43221075523.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613082a7c612f---pibibejalalerumapozidi.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091103324973499.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/69292921825.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/10179063688.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/72131509138.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/90030000183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=phonebook+new+zealandPDF 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_off0000bf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 17020 bytes
SHA-256: b633480a543fafe599c743164dbc293f791c00b040e9128bd57461fa8e713222
font_02_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 10268 bytes
SHA-256: 1cffa7a6bec73ccfcf13607e47623eb62e9c9b638ede234f22531281b1eb10f6

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