Malicious PDF — malware analysis report

Static analysis result for SHA-256 e486f38213c830ae…

MALICIOUS

PDF

93.2 KB Created: 2021-09-07 10:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d8d53a95cfbd492f49b59fb927e2a8e SHA-1: b5a4ebb6aea3a56a106d529cb96ada14ca951590 SHA-256: e486f38213c830ae704a8bb2e8a9d9cb96981597ac4fd7c85aa1b67c2cb65315
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the extensive use of external URLs is a primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=umayyad+dynasty+achievements+pdf PDF link annotation
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a54758a5a00---pisutob.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d0092549fed---2952006831.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/62863646622.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84737435849.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/50422990987.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9ebc701ba6b9564d72adc3be6ee731cc/95151156215.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/setetipod.pdfIn PDF document text
    • http://iviltra.lt/images/files/rifumusekunefuj.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/pelipa.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/40646207105.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/89084002033.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/v1aa4lnqfqnc1kgcv5ctc1bniv/73478417195.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820f1d2d3a5---luluzupumexupofoberujugi.pdfPDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/51185ac31dc24d1a1647c260dbfc27e2/27536345887.pdfIn PDF document text
    • http://calisnt.com/uploads/files/fagukalor.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e5af0ca6---18761432482.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/titovasanobemadeverimixos.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b49987174---sesidulo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fc415861538e8e0d2638b93e64337398/rinunijufab.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608626a035bc4---vixofoxakawevofud.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/zinijir.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/0bf48d8f909f9a343d156e78de83a007/74844815841.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/55604363329.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_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 18032 bytes
SHA-256: 2b32454e5c8594594863b6e41e7fa9dc14b9afb553b2aeeab9f159d37cc0e5f7
font_01_sfnt_off0001361e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361E 10804 bytes
SHA-256: fb2016e591291723acd2400c34ece0a55424b81b19e95cae2aa4aa8b26dd32b2
font_02_sfnt_off00014ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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