Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f848d28da72161…

MALICIOUS

PDF

75.7 KB Created: 2021-08-22 00:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11c20937abd859322b1b62ebf9d8bbbe SHA-1: 11cd0da51bf90fd810e23c538bfaba71e9a03667 SHA-256: b5f848d28da7216175950025b3be5b72fbacf026522949395faedd1f83f535af
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of multiple links to compromised CMS upload storage suggests an attempt to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160985fb39652c---nasaf.pdf In PDF document text
    • http://easyreturn.store/userfiles/file/46336000933.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/52bbd42f74bce8726334c8c6f963f5a6/luxirixavafipuxina.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/0bd4ce67849d2e0ab2e2085d06b22836/wusuguwunagokitagenoxej.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/sujifozupikonowe.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089db3e5d4ab---roxiga.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210814_68C93271B3169737.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/wubegogogisodisoveroro.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f85654c8b---xewaludisarovon.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/40373794177.pdfIn PDF document text
    • https://anjingliar.com/contents/files/bunuxigubikugapegus.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lipf56og0ar18jttsq5l4v090r/fijizolixo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609445580e9c0---71076452854.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b907ce1fbc4---98239228089.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/m3bg7bpnrgadl9gugvl382o0it/sulodumoxijopore.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/joxozumufazetejotux.pdfIn PDF document text
    • https://bliznacite.com/files/wewebovunisewa.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b1409e1bb---sawaxite.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/92080390586.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/40060985925.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9b72749c879780573e70c923433c749e/63792008003.pdfIn PDF document text
    • https://gdaniec.com/upload/files/vurimitob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=accounting+paper+1+grade+11+november+2018PDF 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_off0000c29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29C 16520 bytes
SHA-256: 80f69bef1893a4099e314e60538f6b910b64f5f5696156d5169a67ba3e0ec944
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 11432 bytes
SHA-256: b6628e9979278181b06e03a1f1fe3764cc17a1d8392a46937557c7df59913e1c
font_02_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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