Malicious PDF — malware analysis report

Static analysis result for SHA-256 0680e9e3c3321279…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 02:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de5668e2628e5c789ef17546aaa9b717 SHA-1: 05eae982f4a5a55856b757456873ed84d5210f2c SHA-256: 0680e9e3c3321279c7832ef73d7a25df751be88633ec07ad871119d921e019b5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jfe.hk/userfiles/bumeresamulewu.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0753ce24f---jetozowawedavo.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/76419642252.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/8203602222.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/xogufamukuwavoduzunasexuk.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/95402714716.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/3615099103.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/15050276044.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/84218941711.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/74661801711.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/59196876157.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/tixifowuvepirejow.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/pubafozurefelo.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/wukezorutupuguvisinud.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d5ab2c20---fibutafalibetejawozitit.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/65157247311.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/04/file/sudabopupola.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/sup045gobtsjidkjlq9t4eud42/pexunu.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/51185492957.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/xidivavefonaso.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/51179110016.pdfIn PDF document text
    • https://dintek.eu/uploads/file/50426573735.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/72027451463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cctv+viewer+apkPDF 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_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 10204 bytes
SHA-256: 0735a6b9ffbe271f939e88f254d3869547c88be510cf66e7f502ada193da2383
font_01_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 18308 bytes
SHA-256: cbfa96b53f652366543ca0bb4bec87a57b9b67c6957dafaf67c9336139bb86e1
font_02_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1