Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2dded21bcd83bf…

MALICIOUS

PDF

90.9 KB Created: 2021-07-08 10:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bf73adf05504bbf031f3a062bbbd72eb SHA-1: 0c3c284b04e1aaefc8fced7a9f33c978a54047ea SHA-256: 8b2dded21bcd83bf4d0c91abe181e53ae530c8fc8e6ff2365c6b6c10ac26272f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ferrogep99.hu/static/media/file/64978202185.pdf In PDF document text
    • http://ifa-astrologie.de/userfiles/file/vukifesenotuvowapuguta.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/rateropomojelameg.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/nexabumuduperenitogafonu.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/4071600782.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/daweridivijolonuxanesam.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e1d0252b7bfd39b8c05f57600e41ae58/6990345857.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/ribigodare.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/34035333197.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/501d66591ad67cf795ef398cfff90419/7050502378.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33672252e---2953225251.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/kalezezowuborovolovovel.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/fkl9me7cjrrnn2v38qlcsvopng/pavupalavobezad.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/0e646fcd9fdf2e7686d787970e0c8a34/73932185585.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2227d882cb---zuzekutokoraneruf.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe2bc4f146---6881277899.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mlmi9t7qinktongthqhga4i8us/66367627386.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d064dbc29---74630935762.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86da8575a---lilaxafigaxiwajefivuvono.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/keporaforekowireli.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/linexixevu.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210624195720.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb30ec6b5c6---bupamitobujudalelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=horticulture+definition+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_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 17512 bytes
SHA-256: 840788a415f6a4c9a0892b7ceb32309e9858fd2f533be983a3279c34ee495c96
font_01_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 10372 bytes
SHA-256: a42a7ebbba131db5152c6e63e4174c474a83fc9d2cbb9025f6d77c3a671fab79
font_02_sfnt_off00014638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1