Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b7c8be6dcc998a…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 20:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a9db1e90fd74461db891cda4f868cb70 SHA-1: 3eeb2f03632b0daebe82fb9efff57d4fa06acf13 SHA-256: e7b7c8be6dcc998a4156649b1758031982bda321e7dcf6581bffbda79b83a96b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised WordPress upload storage further indicates a potential phishing or malware distribution scheme. ClamAV detection as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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 http://parejalecaros.com/adjunto/upload/fck/files/97557870707.pdf In PDF document text
    • http://autosklo.sk/pictures/file/tosifa.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/570d1edd00bb95fcd158343ca56ac14d/zosuxonuk.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021060400382773499.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/zujapiwinibatebuzi.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/jimexabalakulotedod.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0af2b4c8ab---vujufejogarobugakisewumo.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ca59374f15ec90828e86c34e8c48451f/ladadosuvujupefujodoleper.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/wabelekaxuza.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/xanojup.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90a9ccb6ec---liganal.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/felulovubikupuwuwazoja.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/fudukupusagelakopodizize.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3ee144f2e---62247000386.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607622c7316f8---diramep.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7d3663a1---32231162842.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/d02d253a9f5aad73e7f8c1e3fa3f40dc/xenukutolagaz.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/ruzotewufefije.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c498198a92---75019010972.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9ccff7685c8562b90a58a1242f70273d/ranumijarumevasok.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/64031610836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=red+ball+4+volume+2+unblockedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f810.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF810 25100 bytes
SHA-256: c1683d8f47ed1ffc202d6b8825a7adee24823f63c60b4bd24e2289e2cdc49017
font_00_sfnt_off0000c74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 10712 bytes
SHA-256: e57743b01e90f2269ccdd793073b0bac853095135b9556892892c20cdfcfbc8c
font_03_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 15844 bytes
SHA-256: 832a0b5fd24c72eadc0a850fb85e48137abd45151f443a67aa4e978712c75c6c

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