Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f5e9cbe4bb6284…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 17:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b868b3dc264d2386683e228141aa791 SHA-1: 9f0a666ffd4a2fe4b01376b8e52f909dab83ae34 SHA-256: 73f5e9cbe4bb62841170d5088b74922eb8f1dc6ea5bdc08e7a4eed5c6c002318
156 Risk Score

Malware Insights

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

The 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 potentially compromised websites or disposable hosting, a common tactic for phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://linklandhotels.com/upfile/editor/files/bogupozekunebagokulap.pdf In PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/zapov.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/laxelijefa.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/67168081542.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/dudopubawezatiweju.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/450c2b8a4148bdf6386ce625ed5ef848/44463998472.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac58cd320ef---73704810325.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/jawixekewame.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/8116663228.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e36e6cb4e8b1b32b6c06b2e46e5fe3c1/seminaj.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/lulalelo.pdfIn PDF document text
    • https://nasikampung.info/contents/files/pekijonajov.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff6be8906d---12454538556.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/85509363303.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/lejikinunuvilomeriku.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/zuxuxifatufoto.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/14670532976112fed69f552.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/24487141840.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/17995845421.pdfIn PDF document text
    • http://dezis.ru/uploads/files/repigomajamon.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bba89072d8c9532992985e1a4a1190ae/56211377066.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18fa85df09---xagijejasijebili.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/12mrtf3aopmpjborpe7gs8tjh4/xarenisegalefefifi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc128a6084---tumabetelebaxemusumof.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/zupemuditinaxokiwaboxa.pdfIn PDF document text
    • http://saens-jpn.com/ckfinder/userfiles/files/sozizirazigewupitozisiwow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=crop+without+losing+quality+onlinePDF 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_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 11008 bytes
SHA-256: 1671a15099a7b3d2727b23d29f7a30738a39a308e8b5ac1e401a7332ca4b3b38
font_02_sfnt_off00011902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 17712 bytes
SHA-256: 2645b91451fb33f79e9ef31a29759d6325db3cc74c5e194045aa247cc088d0e4

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