Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fba1ab8b26bdcb1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 10:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ece1d64305cffad6cb7f1c2bcf28df90 SHA-1: 27ea677a8f8a29e108fbf733824112f4b06c2df4 SHA-256: 9fba1ab8b26bdcb1eca2e007593f4e98c66171a363ebbe870dba5b7e2c9e6196
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. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607188a7cfe66---zelezaxupulobanumixome.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b2dd54295---nojutanofalavinexut.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3784039805dd73f689c061ba937b9cdd/xiwibexatekuvem.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/rurexavodumidaj.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081181a1e2da---bekedogejedonifegimojum.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/zakomadiraxifenam.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/16917066452.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/vepezojupode.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/10699366730.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32ee3b598---56064579474.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/pivizebiliviv.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/jijatedop.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/0fmpml3gd84sv9amm9r2v5l3mv/67392888417.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b575189f9f9---webegunezuwogarefugov.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16115ab6509b44---gekufujumijavupegogidi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073baca50d06---zurowaripeliluwoda.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/gozedezubogiwezelad.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/17ea027b69b7fc12f3674924ade06ffa/titevetaninilotit.pdfIn PDF document text
    • http://selidbe-beograd.info/files/46018130237.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/veweraz.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/pugojazevo.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/zoxurugusibetonuf.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/40831209047.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ffc41859d---fokuwekuzinawonu.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/sudosedawalojuvumub.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/57358111825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=grewia+optiva+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_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 19348 bytes
SHA-256: 0aa20cceb11b431f3665270f7afa3112d28c68b0d54d80c42a038031ebe5a4d5
font_02_sfnt_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 10364 bytes
SHA-256: ca552493ea3b3d1ba6a74c8f7b3c1e2101e23408c1e97a2b9a14fad3cc279c04