Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c8351e7a9e95a1…

MALICIOUS

PDF

167.7 KB Created: 2021-07-30 07:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3346b3cb83d762ed5e16c62fd394468b SHA-1: fd59dfc69b6ce1030f43ef7be7b2c78bae9e2846 SHA-256: a0c8351e7a9e95a15dcbe304bbce318d0a01b78005e32390ffbd322c2146ca46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users to phishing sites or download further malware. The presence of multiple links on disposable hosting and compromised CMS upload storage indicates a deliberate effort to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tele-video.ru/upload/files/vifisusiwivoxopu.pdf In PDF document text
    • http://sbox-technology.com/upload/datoteke/kitojuwisokowuzobixubuxat.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8f18290b59ed9b7efcd2a1cd01d8d5da/lobuw.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc9dd2c758---56435856864.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984c2677756---fenuw.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/47104060493.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/zejupogijuvoji.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/foxewovepetaw.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f512dc212e0---50364474630.pdfIn PDF document text
    • http://bienbao.net/uploads/files/gumotunoguvanekokomatuta.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609461705ddec---pedawarowageza.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b862d0e0b42741b271ae737f402bb91b/faxekeparix.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160926d7a02bd5---31712665468.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607321bd98bcf---zuziwidixotokuragiwix.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bad9fc9a611---vuzubo.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/vijixawofuxesavo.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/76544990760.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/db42a3bd7bf249b627c4fcb9989951fc/30743485905.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/97288237686.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/68975049258.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210714_132907.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/5532194369.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/sewala.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/xunuwugekafijoruxorep.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/80770416656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=megaman+zero+cyber+elf+guidePDF 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_off00022ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22EC1 10960 bytes
SHA-256: 84262f3ed1b0dc1358c2fbf7d9c8a41f6c1ebfd4743d517a692da44dc876dfc0
font_01_sfnt_off000247ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x247ED 18160 bytes
SHA-256: 354ba38ae903f620eaf11e4e91de907bb4f02e6658695c4eac12ada8056cd6d4
font_02_sfnt_off0002781b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2781B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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