Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70c30aec2add45f…

MALICIOUS

PDF

113.2 KB Created: 2021-06-29 21:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de7b963079d700a9a3f2534159b4d589 SHA-1: f97a59e504847e8a39cf89f801da6998d6bf86ab SHA-256: a70c30aec2add45f8e2a8f82b2a3f7822aa93aab43e508da4cf55be3c6a9dec0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The presence of JavaScript suggests an attempt to execute code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://octvads.site/js/ckfinder/userfiles/files/23963590454.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1662f8172a1f250a64f4831b7202f08f/solukujotinapu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e960af11---16271152015.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b321d142---bulexapemiden.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c09b2404c---86435418206.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/laregil5e8lkabfrbr9u99jh8s/5521890233.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/50467626068.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210608214953_423097086.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6dbd6aa5---xirosepawisewesiva.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hiaq93rve1qv6ikpd66lf24ht0/zafewixewe.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4bgdp3ampf50utujphtu1og9h6/kemabukesaxafibofagu.pdfIn PDF document text
    • http://tochalco.com/uploads/files/nukilutinopufopodetul.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/65314153531.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/pibixekiliguxuxafijuwoges.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a91c0172---baxowupivogivarato.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///xogibozunoxe.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/i9fk8vopks3r9fdj51hftdb701/balilujinajoxizorukewine.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/napufigepidupe.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/ludite.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e05cf33fc---37987293507.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65a21777d---jafitefifusaxijofetelapun.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082a2ef9edc2---rulomagaborosufomosa.pdfIn PDF document text
    • http://altinay-law.com/images/file/mavifobotibimotosuseno.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3e7f60929---7960459035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=embrace+in+hebrewPDF 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
font_00_sfnt_off00013e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E61 18760 bytes
SHA-256: e7c6490764944ab78dd140b01361b22bfa4ba4461164118dc6578c593bc259d6
font_01_sfnt_off00015d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D34 10272 bytes
SHA-256: 8abde805c12dcbfad757d00cb8ba12c8eb242d2f9ca431bc9a3191d86a261e73
font_02_sfnt_off00017414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C26 16604 bytes
SHA-256: 10bb2de28274e2002513563dea8f140c5312a01c1895fe89288d48332b23c1e7

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