Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dec05b0b394c9f9…

MALICIOUS

PDF

76.0 KB Created: 2021-08-06 17:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae521bd9434404f50580b79251a6889a SHA-1: 04e760fd464459df506e38723d3de7175dbdc666 SHA-256: 8dec05b0b394c9f9b2c54a77ccce22bfb15133bd5d9332bd2a38b17093f5c330
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample was identified as malicious by an ML classifier and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the use of compromised websites for hosting malicious PDFs, suggesting a phishing or malware distribution campaign. The document body was unreadable, but the presence of numerous links to potentially compromised CMS upload directories supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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
  • 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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b62e9bdcc3---ziwifonetapukivixogodo.pdf In PDF document text
    • http://crmrealty360degree.in/userfiles/file/40695418176.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/zuvezikadipojadexuja.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/pozokaxewosip.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca02849bc40---xerenawik.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161029417ef974---folavoxijus.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/detik.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/s94185svk92q8rbkud2gfoqv3a/raxizavekogewek.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc7865c7d---81654903644.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b1a2fc63b8625e18400d6a9fc2bb8023/27042157512.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/kulesoleredozumesuzujuzew.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/86593766160.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/jinuzenitutapazivesi.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/55502485175.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/3potsvgnfso1sj725qq1pm578a/rizepexodexojoturorude.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30208d6929---42374784999.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/41315207309.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/af5dd01daa3e44826229fb3bfd132ff7/27298700068.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/zudago.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/wolegirixuxakuworadaxa.pdfIn PDF document text
    • http://eibich.de/layout/bilder/file/73136967315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=krugman+macroeconomics+4th+editionPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/2778809601.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_off0000c58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58B 10940 bytes
SHA-256: 03e8851d7fc19525b0b8d5f95d02ba3e507d833c04ba6b70db977e796f2e2c58
font_01_sfnt_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 16680 bytes
SHA-256: 857e2c90a6e643930feb899eea076fe6b446bbc190ab41f390bb5a7526f40761

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