Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5aec7bc891f488…

MALICIOUS

PDF

92.5 KB Created: 2021-08-06 21:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a37aceb2eed694fc7665a20ab5e6990b SHA-1: 07af5f881d3ee1594213d42327712e0bc99c26bd SHA-256: aa5aec7bc891f4884e3d6c7d0133821f57b992c89554f6332e8e0742655297f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are designed to lure users into clicking them, likely leading to further malicious content or phishing attempts. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://monyetmesum.com/contents//files/sanodedo.pdf In PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160945993869fb---jeroxexatepisuvekidinuvip.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f60ca66b6---zovixuv.pdfIn PDF document text
    • http://agrion.org/upload/fichier/14060745635.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a31bdcea84f---52721722911.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/83495881380.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wotusuradoginav.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/98047335761.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f5e711a6b---gemumakojizuron.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/tifobapifizamaxixiwu.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/18061d912342e5c7b85944bbc2a801a4/nefepejome.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/vikiteju.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c0d0a6a5d---vikorafozitu.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/54439980742.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19b81cc8c---pubugudesugofeteger.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec8f46b53---51800571450.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/77351059712.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c915581c00c---wutovorewu.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/98004000257.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2f8c92f1e---bekiputariroko.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/75364557329.pdfIn PDF document text
    • https://lapakunited.com/contents//files/salivodetuf.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/gulowuponosefip.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/vobeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=simple+balance+sheet+format+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_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 11100 bytes
SHA-256: f6874d96f5491aa3f7810a90dc22877fe94c2a1dc9ee5d7d7836fa94007a93b2
font_01_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 17108 bytes
SHA-256: 380e84ff7e68231026fd340d5b0b219cc4947fbce27fdda0fdbff99a7e9d4020
font_02_sfnt_off00014b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1