Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b687a1fc337249…

MALICIOUS

PDF

99.4 KB Created: 2021-07-16 08:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a8f560f9a3e12687cad98a8f8aad519 SHA-1: 826da331d4a01ca12b1b03633749404c37890273 SHA-256: c3b687a1fc337249ac6a545a2919eac658d898e8917afc9408462dee073f83c1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or downloads. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 http://funperm.ru/content/file/buxobewixosibuge.pdf In PDF document text
    • https://krono-original.vn/Images_upload/files/39125802877.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf373a695---repex.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0f527413efba34a97caf19bec288b65/71203283856.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fa03efe6828c903e7ed43c68d4ed1b50/71413862366.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/sadaberojafifamixulog.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/9563007993.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6572269651.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/81600690065.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/kutuputukavajomeke.pdfIn PDF document text
    • https://tomas-music.com/contents//files/bawuz.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/56254853131.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nidovezibefazufolon.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/defemapefuwi.pdfIn PDF document text
    • http://axwelindia.com/uploads/pukodimoxudosidu.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/tuxeximafiravafenixuzi.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/13282143297.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/famefageboraxokemigebanip.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e4acc4a6---benadufewitevixonudifefu.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/lovifobumakagapogij.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///monesixinawopakit.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6b7d6ce7---lefukow.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084987cbdd88---84143832229.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070d2da375dc---56451079442.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/19729944287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=windows+10+special+charactersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 31940 bytes
SHA-256: d9bec750daf520d607f1a597a2e097c7e58f889fad1b411f0ecdf29914d019c9
font_01_sfnt_off00013861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13861 10864 bytes
SHA-256: 11629cb018b4b72c928a0e79c15e3d3db9c5f3039b77f676f2fbbd848804190a
font_02_sfnt_off00015173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15173 16320 bytes
SHA-256: b59d6e7dae4a7561fbfbef93b720f3c15e87d7a1e42867afaa186f3f23061f4e
font_03_sfnt_off000167b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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