Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2c50c1fb8c799d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 13:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8c8585c09b21efcd74890ba4175ed51 SHA-1: 91be1e338ee673b31352f555327859523bdf4eb2 SHA-256: 0d2c50c1fb8c799d27b69fe7e293d4b81ad3a20ecd1c48e0f52c989e4f2d12a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting suggests a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://youngthisyear.com/ckfinder/userfiles/files/42614249058.pdf In PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tt1k5u45q7fjhvh17qmiik5b5g/74533452057.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/sujapu.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/xuxag.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pke7bf2cn6otndsl7ec6ra9nqj/suzazitosepujivi.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/82050289327.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/85a7b50cd81f308a861f6a0c2f72147c/6209242687.pdfIn PDF document text
    • http://happy-land.hu/editor_up/52660712766.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/45987588848.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/94295821375.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/dexuvotipawor.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/xufonulofoge.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/tijajuzogugekaz.pdfIn PDF document text
    • http://kasargod.net/uploads/file/70501890001.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/66825959985.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/30672705667.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/11815430063.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/godisomomatamo.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/91405131064.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138a458ad757---jozoloroxegopa.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/16408829213.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/sanixomulunove.pdfIn PDF document text
    • https://promise-land.com/upload/file/68925585374.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/zaxeguzufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+ttf+fonts+for+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_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 17556 bytes
SHA-256: bffde480a491b89a5212b0f71343739d8a421b8f9aef50a50d02f55bbd8d9019
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 10276 bytes
SHA-256: 2d6e6fe82a822d171bae2872139dfec667b984bd062a5fe31a82456b16bb81c5

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