Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec0beb6b0c558d9…

MALICIOUS

PDF

87.2 KB Created: 2021-10-04 20:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8ba4ecd2f045df4d241c78926c554f61 SHA-1: 48d0d38f54c5031a19c6d09883e0a5d8fa9ae741 SHA-256: aec0beb6b0c558d964f24c516fcb3ec0c2e8caeb3deef01f39bfacb687310290
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains. These links are designed to trick users into downloading further malicious content, as indicated by the 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • 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://archism.ru/uplcv?utm_term=if+you+do+not+tell+the+truth+about+yourself+you+cannot+tell+it+about+other+people PDF link annotation
    • http://jrpst.pl/userfiles/file/wurunimizezodoravut.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615839bb24fd7---71355540869.pdfIn PDF document text
    • http://fitviewer.biz/files/file/gagutilisigibumimawalumu.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/xatafurowimogipizufok.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/91710439585.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/75237845718.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/a4e8komgqkamnmmms8hg92mpko/zatamazebomavorumezifemo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152fd5f9dc73---pisosebududi.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/girajotibitiroxefo.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/54132969905.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/5341262288.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/bagokidajapeziliwimukuj.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/77484769941.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/gedigosopitomegepob.pdfIn PDF document text
    • http://lecostationery.com/files/file/bamalabuzo.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/22266957546.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d42b62183---8154090007.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/48937702238.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/tumerexaxedujoxinulupeb.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/muxifilofopeta.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161466cec846aa---5358913745.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/29334516354.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/56f8d4609c0f9bc3935ba984ef6d83da/kufanonulenujodonafofa.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_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 11024 bytes
SHA-256: 3b019fcb822780a33db65fab67763d2460fb0b0454573e434172d0a292452aea
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 18932 bytes
SHA-256: 811f6b16113a6cbd62737708aa24ec26a646f6165965489c575b22593eb69a58
font_02_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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