Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d8c7eba1805902…

MALICIOUS

PDF

68.9 KB Created: 2021-09-16 03:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73d2915a1bb8f89677a72c5edb292e67 SHA-1: 91d43920a841077a94f79a8b2ccb490b856bdf59 SHA-256: 26d8c7eba18059021023066a4c8ac45e6df076037945346b4045f19d1548b527
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure, being image-heavy with minimal text, further supports its use as a deceptive interface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=cricket+19+download+in+android PDF link annotation
    • http://restavratorstvo.com/ckfinder/userfiles/files/69549030036.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210906220739.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/kutox.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/jaridenowewoxik.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/pipoduwoxutuweje.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/60408939592.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5221140f---92614813388.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/67931565784.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/649o093g1gmeeumkm2cm2jc5mu/lotamirisijalegawivewetog.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/53150488811.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210909160346258.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/61010348506.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/visize.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77677308971.pdfIn PDF document text
    • https://cardolf.ro/files/wetuje.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/58733988855.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95531b219---lijasebexikimuloz.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/55082739025.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/sizirutolimapiteketimon.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/5866070743.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/tidisobijaxowedow.pdfIn PDF document text
    • http://goref.ru/files/file/15944610713.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/puribesepe.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/25406612975.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_off0000b21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 14204 bytes
SHA-256: e854e73b92e0aa89c8ee6beda365387a7087c08367b14909f47ac4a0676d5742
font_02_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 10624 bytes
SHA-256: 9aad5de0b5a0df48373beeb9a8698f36b3efb771a12fa092657afe46aef95c27

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