Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40dd6e808df9118…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 21:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ceed49499d03f51c2298d36fed028571 SHA-1: 4f4f2dacd3c8fc79a1cf39a422206314372d9eef SHA-256: f40dd6e808df911888206230b973448e748c14ed65fb377b0fcb99f2bd449233
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external links suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://egyptlance.com/userfiles/file/28012217443.pdf In PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210904015734.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/mosenafokufakagax.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/85dabc649bee9ad505799a9d232b53d4/48423914968.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210912/2159344303.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/povapewudume.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/lefilosopapipokuxut.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/valalutusugekija.pdfIn PDF document text
    • http://rurisnet.org/images/file/90802631060.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109061142599806.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/8021511929.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/fatipebepakuxosofimikaz.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133373bc5882---mavurebevufavo.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/puxixujidofizadubu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b5a541161b---nusutajimevefewo.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/31502726826.pdfIn PDF document text
    • http://thongthien.vn/upload/files/kakesepotunewusuxap.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/fuzadorup.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/wadupilowibulalewinuge.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/92643345973.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/85234350648.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/34244753713.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/16444042171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=french+movies+with+english+subtitlesPDF 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_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 16672 bytes
SHA-256: cfad66e3f08664019931c59d05d1b2bd5994e704c7e5861a7c14a99a1fde5a35
font_01_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 10884 bytes
SHA-256: cb08e5b0866139d98156950ce8d30b3ac2315e6c68bb170c5e47b0e93b460620