Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6f92858b012c05…

MALICIOUS

PDF

83.7 KB Created: 2021-09-22 12:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76ceb6ebe10db753d3d3247ff47bc277 SHA-1: 35e18792aefca62302195334225d2e7c239815a5 SHA-256: 6b6f92858b012c05a2ea1d1b909ec19354551f9218f0f6b9ce26fb5d5b0b8edb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to potentially compromised or disposable hosting sites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=call+anonymously+android PDF link annotation
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18198787551.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bd12206cd6f7e6b4a33ce221567aeb43/16626264554.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/55823464828.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/komaxuparafiwukumidewafid.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130632991825---zovatorarulefijuzevo.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/foxamogoxepufinakadukana.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ae23147fa31257a94e887f45bfb9ff18/61065698783.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/31557737337.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/benawugudupudubu.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/19338154835.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/46422227521.pdfIn PDF document text
    • http://bienbao.net/uploads/files/tiruwota.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/gesawutomozedomutemozuk.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/77eca92b24928ef51e7df9a379a92ea2/86348473215.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/83741269790.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/tinowopekasulilifo.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/bavapifuxebepapavutesi.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/winawikegeze.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/15285102405.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/3550591435.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/22437430933.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/janumikama.pdfIn PDF document text
    • http://hidropro.hu/upload/68953387399.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/8102116054.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_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 18328 bytes
SHA-256: 1b45b758ad62da4ffc17f84d66e5bfcacc7f030c08d948e52c2156037fee033f
font_01_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 10424 bytes
SHA-256: 1292cb370e2e0f488233de694a33ae71c7ba8ba486a2c3f9a0e3ae759f7aa919

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