Malicious PDF — malware analysis report

Static analysis result for SHA-256 a461213aa423e59e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 20:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 964eb3e6d31f458e711562de87589d48 SHA-1: ccd091be9ccbe538b3bed02a5d149df74d8216ee SHA-256: a461213aa423e59ea196695e2f3b4438f44f9ae804613cb98e1df531b5fe5647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely phishing-related. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://refpecsbelvaros.hu/kepek/files/jogalurexexe.pdf In PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/16858360824.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ee1d25e1---togijifopebibikag.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/56571442992.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/24419233479.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4aea9dfed---12761647632.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/97110486876.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/kavopupujozunogup.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/xatipozadepi.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/murasezugajugem.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/23689085080.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/sejitokupidiwibuxetudita.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/noduvakilugevoke.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/nititizaxamivazefojafalop.pdfIn PDF document text
    • http://gespk.com/userfiles/file/41465090277.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/32086286322.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/826073984.pdfIn PDF document text
    • https://curvy.tw/upload/files/xugaru.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/76887985992.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/bitazoxejopotatej.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/sukilifinuwugovoxove.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/40286219213.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/jowulawemunadojeju.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/zatotujezav.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/bipadodozoromugefomibegav.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/gotadawaxepibaxude.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161355aa19f199---velamorivudobepimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+backup+and+restore+sms+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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 11036 bytes
SHA-256: f1f9fc5c8ad6dd252f9749ef7d883b4e78f7e4597b742e3647a620b344d429fb
font_01_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 18124 bytes
SHA-256: be759fc42969d8a874eb7caea6b80a491be1c30feb1d729171b80164d94003d9
font_02_sfnt_off00012913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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