Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c58dbb31ee4053…

MALICIOUS

PDF

75.7 KB Created: 2021-10-02 23:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aa17f30f192a5d44eb11b1db6c31172c SHA-1: edd4cb215407a07ee30ee30d3559f484d6aa7332 SHA-256: 90c58dbb31ee40531b8973a0014360d04a46ba7bbfa2fac9513279d2aacd73d7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=desi+telly+colors PDF link annotation
    • http://cissi.it/userfiles/files/vefubudamesapenuguki.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4063509bd1f91faad91169481f92bbe7/kevatebomu.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/tuzuwemojuxinewa.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161506f9be1481---bilojusotigejakozel.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/fiwomasisobibufalo.pdfIn PDF document text
    • https://n-tlg.com/files/file/72610294087.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/33626277891.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/56133783080.pdfIn PDF document text
    • http://cssh.es/img/file/degokozizikijuv.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/bemimo.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/pejaxaxolunavowe.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/nitulojum.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/58a1a661875f633376cd5ef49de7dd54/73958359729.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///libolezunerexigatugajug.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/rizos.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/79473839834.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/68230404080.pdfIn PDF document text
    • http://lgassociates.in/uploads/zamemenodugix.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/vapisawazadubuvitalake.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/52894240687.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/qdtda69bpsgtlrv9j06svet2ia/vekinifox.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/lubofu.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/15196057972.pdfIn PDF document text
    • https://kokomanis.com/contents/files/66932223732.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/96035654141.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_off0000bed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED4 19376 bytes
SHA-256: 8dfdf0af7f1f59041d32fadbed207d12f6498610662da24ca10602ab91acb451
font_01_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 10072 bytes
SHA-256: 59d993ce0f035277b13daada882190a3e699a70f7d238b90e4640b5c13942e19

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