Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efcd2481dc97a1d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 02:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a19c7d33b2ce63eec3892c16b4663b8c SHA-1: fa13b9f2a437cb0299707585452728061179d15f SHA-256: 3efcd2481dc97a1d4f323e1e30bcbcc1d9b4ef35a5b9cfba35348ff1ebb1e1cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://ketchas.ru/uplcv?utm_term=best+facebook+apps+for+android+phones PDF link annotation
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2796441405.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/wetuxopabubamupil.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/59843660116.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143045d4a94b---budibiwomil.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ac09e6b8---dumalejoxokujavag.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/papufawobawowigomefiz.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/64863259323.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/87864519641.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/daluteroderuwizibawiwoz.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c1068fe7998cce43165dc121987480ef/81379514840.pdfIn PDF document text
    • https://redac.ch/upload/17546716724.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/veronuguzesonawejotojin.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/vipinegaletotovozoluserul.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sasupodotikepekowageb.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/14712541378.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/26775799631.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/maturazevasepa.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/u4utp5a0fja8s91a0onou4447f/ravuweposipopetozir.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/84875162041.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/nubon.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/rijozoleje.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/a27c8420902b4c145694bfc55026464b/63475293457.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/fesorigipiganebi.pdfIn PDF document text
    • 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_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 10956 bytes
SHA-256: 49f28fbd03aaf6198fdb4bd82582fc245b556dae6f1972c4eb2fe08778637762
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 17620 bytes
SHA-256: 529d9daee3658dea876ffb493e59782cd677a70e5a2bbe2d96a7e47e26cb453d
font_02_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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