Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff10d104aba3b88…

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 05:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98d78fccce05bdf59b8dece393c6cc0e SHA-1: c1c4fad024584766299287ee063bdc7d279b84c4 SHA-256: 1ff10d104aba3b88d8c9521003492ded1fb44ee4bb7d361ae8a325cb0392dcb4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common phishing tactic by presenting an image lure, designed to prompt user interaction with an embedded URL. Heuristics indicate it's a link farm hosted on compromised CMS upload storage, suggesting a distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://irlanc.ru/uplcv?utm_term=barbie+dream+house+hack+apk+download
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423890a82fe---86507846029.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/burazujexixu.pdf
    • http://bbdecontra.com/userfiles/files/gowijiwefapevewuziwukebe.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/fatiwifetulunoxurer.pdf
    • http://risme.vn/files/dilelixekug.pdf
    • http://j-line.ca/fck_upload/file/89142468131.pdf
    • http://onlineticketreview.com/images/file/vulokukeg.pdf
    • http://tdbakademi.org/userfiles/files/70672760633.pdf
    • http://orthodoxnews.us/file/60091321927.pdf
    • https://konchris.com/userfiles/file/1631235172.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161428c008fa53---gexojuvidatusuvusijik.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4b097beb---peselol.pdf
    • http://tuning-zone.eu/userfiles/file/jobekusomivadodedagupoja.pdf
    • https://vibingvibes.com/userfiles/files/7665973666.pdf
    • http://brenna-ski.pl/userfiles/file/ruveraretu.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/nubumajadakiw.pdf
    • http://pinturasoltra.com/images/slider/files/kojexozerozavupufivo.pdf
    • http://abwsalisbury.com/uploads/files/vovafilixegezeru.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea14d562f5---xejuvuxolilun.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161468cd7bbb8c---serilapatakupam.pdf
    • http://janjoling.com/public/ckfinder/userfiles/files/mopevuxizanuguxupewe.pdf
    • http://gainliving.com/upload/editor/file/baliwosakuvizufofitipupif.pdf
    • http://smm-mm.com/uploads/news_file/94319055708.pdf
    • https://dzido.pl/userfiles/file/64406220051.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613db5967fc0f---zetijawowu.pdf
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/46644653797.pdf
    • http://htygroup.com/upload/files/90347346367.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b32f.bin
aba876e8eb1af3c6908fd05578ea1fc040884ee2d15b797f60541ef6f6fbf5a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 11152 bytes
font_01_sfnt_off0000cce8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 16792 bytes
font_02_sfnt_off0000e4fa.bin
b8a4f7b96472b4e81347b0d283640f86c34873a99922be4fa783704ba2c62755
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 13968 bytes