Malicious PDF — malware analysis report

Static analysis result for SHA-256 49950f06af54e635…

MALICIOUS

PDF

74.2 KB Created: 2021-07-06 09:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77b404d0a912b8ce7bb81086b944c5af SHA-1: 4fd435700c3a4a26d2301d0110edac6df858d00c SHA-256: 49950f06af54e6352dec9ffcbfe9ac9cf4b842e9e8984c34d6dcef1d63314f61
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://agataklimowska.pl/userfiles/file/lazusemuwazijoxutomoka.pdf In PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/68c1a2d247dfe9611d8b972d6d804208/2861183652.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/80023156460.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/9223381162.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/razuwegulolegafu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/372b6792b2d6c65550a7d21b3bad8404/27666327145.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160836ef6f3d87---82408278292.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/juslh3d9b3uoebloe850qmlgvk/marezabimirudaxebegoz.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/59c95cc0460a6750436f6a03a2522f87/25419981421.pdfIn PDF document text
    • http://deforma.it/userfiles/files/79228961329.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/benarorap.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/terisuwebasokele.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///48746383575.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/wugoxaxaxufufofumoxazolej.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30df26caf---64590075585.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/91879653652.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/ruwujifurulasonifiwaromo.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/mifagotepafovokibajixewis.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ba4ed2e3275b22d708e4d94aa4f4af21/gufisefupowefejopezozedab.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/biwubetadonuse.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/75726163768.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9ea0ea5155948e82255b3bf62f99dcf8/3840846811.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/bsi3br1ua2ksupvkphj7crklql/ledukodas.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8cf4756486b29896f8977451bb706b74/72253222280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=types+of+tax+planning+pdfPDF 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_off0000c156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 10752 bytes
SHA-256: d5a346f010cdab4187d19c601343e316ae337ea1d4f3e2c2565058a0203fe72e
font_02_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 16008 bytes
SHA-256: 4fbf059c0ac78e567750138aad30e7dbabcdfd051ed17c439fc4916378a34fb5