Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c3e3d8b465f922…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 10:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 951d5409e81cf36679d23352fd8deed0 SHA-1: e62ced50e1bab3655d548aca8a5350b92158719a SHA-256: 35c3e3d8b465f92202d6afa4e6d26e70afe0adcbf785280645606fa126eae510
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=overcoming+gravity+second+edition+pdf+free PDF link annotation
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613879ecc37fd---pojugekiki.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/69132549626.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1c4d44c7---josimefu.pdfIn PDF document text
    • https://olterus.info/contents/files/kubafipinuguzikunis.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/xexatuxasixokumod.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/peroboti.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/rixivujodu.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/kafotifixuzasuvedu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e701f486879166475f5c64e6ba9136a5/6858049185.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/73594337526.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/53414280937.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/juwinoka.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/jobulopam.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/84308714654.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/089323b5b4b79b1eb1fcf9f131d57982/72075299319.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/xuwubuvelivon.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b1a1ef5fc---didumupojifetanopukuk.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/nazibud.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/1997686730.pdfIn PDF document text
    • http://elskenecologie.nl/files/18493815661.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b79b425e---megarafoge.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/japezomunade.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/83467248693.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/pilajuwodipofinigubuzizeb.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/dixawomo.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_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 17248 bytes
SHA-256: 0f5fe008e11c46da97b2044d8bcd2a286bb91e108cbcb68a64a295d14ae66189
font_02_sfnt_off0001231f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 11120 bytes
SHA-256: fda4a36a5a5ed22b47f4594c038d4c8524971e8a27b8170b2d8c52895529cd21

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