Malicious PDF — malware analysis report

Static analysis result for SHA-256 46977075ad4dee81…

MALICIOUS

PDF

79.2 KB Created: 2021-09-10 12:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b0605fb0d227137e629704bf0c64572 SHA-1: 5b2c14ae4430e71a42b38118bc6f356ffc29b47c SHA-256: 46977075ad4dee81187998243715f97dd755828eefb153487b878a1505169dfa
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. These URLs are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/fepurawaxa.pdf In PDF document text
    • http://yourhandmadeitems.com/userfiles/file/35175229166.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/jasisedegerogusizotumer.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb705fbe3---43577141370.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16138325682ce0---43810392160.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/73696797036.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/nubafetabigubinala.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/karetexotanamulewu.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/65376926797.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/vaxowuvo.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/81652170627.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/ruleduja.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/kimiwixorofebobazex.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16133988756418---1056513392.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/paxogo.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/34953426810.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/12935704896.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/jugusujelezobusurazodi.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/zopanaxevuzagode.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/jurojewivowinivumazojer.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/gabagolasunal.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zulorezejovoli.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/loduzajuzegogatobovusolu.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/sukodufenekanizuvupozadem.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/pedijitisujarakod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+change+the+clock+widget+on+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_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 10648 bytes
SHA-256: 348991d491ffc147139808cf6a0ac4e6c07b363bb2442ec350ae6fc6dbc04dfd
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 16816 bytes
SHA-256: 1fd1d6d28436f8cf75e6616d8677dc9c5e3c5e9da3e43484633cbe6cf7f35d10

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