Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffcac24334219b0…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 12:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82c473d20aa4278f35ce9c626c4dff30 SHA-1: bfb8a6074853a4c9cf0fc6de61281d99504b2318 SHA-256: dffcac24334219b0c6ff9a7ca63387de48e906429448d45d6aa40a2050280bf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Several URLs extracted from the document point to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were directly extracted, the nature of the link farm and the presence of external URIs suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pilot-nav.com/ckfinder/userfiles/files/53911158348.pdf In PDF document text
    • http://szolnokepul.hu/userfiles/file/38480488572.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/57648114486.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/75024377215.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/widaribe.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135e85f3f061---95378312982.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/28341460379.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/82580300634.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/doxojolojiwowevawiza.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/sinizamamimovi.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/pedojivureno.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/xogetuwawedabevadi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ir2mncojh3549bm9esmactub9h/39060703666.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/59970326978.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/43083439571.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090422423973499.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/diwukeri.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/popolipef.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/bedelibufef.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/87591513558.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/87487476359c6a81028f9d007d28c494/11679084431.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/84572256792.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/68570540544.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/kejiwazusijonazivuf.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7c6e1ac05cf3be13dd9bd30ec7c2ed1e/dememafudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pogo+iphone+spoofPDF 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_off0000d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33B 18528 bytes
SHA-256: eacf85392d8fa7ad97d41ea49d0d82971a2884c2f34b786f2818db72dfd7d8b5
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 10232 bytes
SHA-256: 377a8d916262e5f164f53f37a018a4fbb4b98192c897ad82b452083c0b027246
font_02_sfnt_off00011a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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