Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b5555940a4e151…

MALICIOUS

PDF

85.8 KB Created: 2021-07-29 18:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13a551a54b209d167383280b07e11ee9 SHA-1: 2fcb2d84c6ebd24cb88589d561bec73c448585fd SHA-256: e0b5555940a4e151913652754713a1334f70ca1653f8c9c01789a57499bc9843
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these link farms and the overall detection by security tools indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/g1iva8134r2v4ng0ak2aeesb2o/pibokupusogugofi.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3c8c4263---jewifosit.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/qs8akl7apu8aun51luq0d3jhfn/39898211652.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/waneladajowosevagefun.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e530d3726---sunoreb.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/gamijunegi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083966e93666---82265566329.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7mmnbh9d2n7ghrsl5eu9k2ngm0/20705614416.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/bopegejonubumulinixuzolen.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/077c73ce44f32f965a55896c646c7805/tirujafudodojil.pdfIn PDF document text
    • https://avela.md/userfiles/file/85057882466.pdfIn PDF document text
    • https://apizf.org/public/file/ruluzexuvomonaruzowawi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a484ec1c8---dudoxazipetow.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/wexuzo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r6eff8pp1k4hc2psr79o64cn42/kiwuroviminexudugoxotikak.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/nsv0p4aktusbko2kcf5hod49or/tubime.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/vikud.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/66447788052.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/91974268121.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b19032da20---vazugusebojugodiletisat.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc35c0d6f---7631559555.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0501cd1b8---gusux.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/sujafamabevajeked.pdfIn PDF document text
    • https://tipresentoio.it/images/file/gakezetubuzadorefupojed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=masterbuilt+mes+35b+electric+smoker+recipesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 11060 bytes
SHA-256: 0a8db30981c952ff0a5f3cf2d445be1a31c8c374577e7adb7efbec82ba0cff8c
font_01_sfnt_off00010aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 17112 bytes
SHA-256: 30314bca65dfe3085711497c6e112ece21d2d705c033fb0f590916e3c6fbec6a