Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99d9f7e9c4910e2…

MALICIOUS

PDF

90.7 KB Created: 2021-08-03 07:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a0abc2592d023f5a4b33926983b665f SHA-1: 04e9715665b3d088fba824ef75259b9306239928 SHA-256: a99d9f7e9c4910e28b51cb02b3bf9d308e81b27d39c89445e73c3b3582bd2553
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, some of which are hosted on potentially compromised CMS upload directories. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tvoirostov.ru/ckfinder/userfiles/files/difibewixomapefaka.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be0bc660dc2---31124708021.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/gepetuz.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/3d5ig7s5idfqll67r1gjkbfet5/mofuxuvalefiboliveke.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/99851776142.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/468b14d98112af07b2e92d2863fc9549/6831544606.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ce54f6ec973---19292143276.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/xakobodipumarakutovefuwe.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/miwuvogezunusem.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085491d1c368---38618399832.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210710_145154.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608079d58ea63---pozazisokudegedir.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d2f48c3d78d359c0d5e5959a53c76c99/89183818782.pdfIn PDF document text
    • http://tayles.com/uploaded/332308081.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021080223393395.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/bamexewadaluwupumutet.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/22256852349.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/kadutajolig.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/34593801142.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d439caabe---31726077920.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/21d10960b5f64f80b433a246347e07ab/33630277161.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/sulezu.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/nuxekozemar.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/gerodu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3909e04fba---82805958064.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/54965304023.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sulexaxotopiwumikim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+cancel+my+avast+cleanup+free+trialPDF 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_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 11136 bytes
SHA-256: 60f65c5da5e6b8c4c990a755539864694312cd0db11384dd33e0bc7c332c0c2c
font_01_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 17356 bytes
SHA-256: d1ad3d34bb55915496493436a37eec3f49c21611dfb9a28432ff224a4f66f5a1
font_02_sfnt_off000141c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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