Malicious PDF — malware analysis report

Static analysis result for SHA-256 84769717015680a9…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 11:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52e5ff9b6a944a6ccbd96d6b916ddb17 SHA-1: 55e787e61ec5295756f2115e3e53f32ff852bc79 SHA-256: 84769717015680a9b290e396551da093e1a1b93d5cedf7ea15efa79b25be6690
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=law+of+sines+and+cosines+word+problems+worksheet+pdf PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c84da538bab6153bd769d447f9002c0d/ronodujejeleleramesonel.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/ranokak.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/gafigupazemumelu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2f06ddbc10a6ec6a5f494139e59d9086/72174048046.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3b874b28a32da0bdcb078e8ab8ded19a/34783783.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33f18434b3---56652079215.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4d284bc094052fe7e6f647bf11a797bc/faxasoruzirumufaru.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c2a545f21---94237541358.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/73219720737.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/wepomopezatogibukasa.pdfIn PDF document text
    • http://patroha.hu/file/tafuvefus.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/75837395597.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/pesalixirobomid.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/xalavajupupu.pdfIn PDF document text
    • http://rooptex.com/uploads/39035352921.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/78219838945.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/pexanepuwipijino.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/it2ej4uhmsij50udt665gemlu5/28212061049.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa01923c5f3---ripanemopajalojut.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbde054ff2---matugovegosarozefi.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/fokasulosezaxu.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/jaruliwujiranajo.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/gaxolajupaxo.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_off0000cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8C 18548 bytes
SHA-256: 0643d1d237317346b365fa5f552ecabb503d99c47791fdb357ddd6880debd9f0
font_01_sfnt_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 11160 bytes
SHA-256: dd5e8b4f75d8344dd231a14a4abd4420e320f36c032c52587769fb0c80630651
font_02_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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