Malicious PDF — malware analysis report

Static analysis result for SHA-256 274888545b9a804d…

MALICIOUS

PDF

90.3 KB Created: 2021-08-25 03:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 537ad4eaa04fbc8fce2c04e8a81d2b2f SHA-1: aaf50c06221d57da49b6034af460d6d282b0f215 SHA-256: 274888545b9a804df5d6700ef080251b873d17579c7a71114c4c59294139dcf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://laborke.ru/uplcv?utm_term=vlookup+from+one+sheet+to+another PDF link annotation
    • http://cleanyachts.it/writable/public/userfiles/file/japuzugekexoxuzojalas.pdfIn PDF document text
    • http://minhanh.com/files/zopegatukovik.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2ea75ffc74133474a17fb8f2d4953266/vumelasotufedexi.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/47444473320.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3141b47a79fc534e71c03cf0c8889e88/25439069523.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9e014d46---67785938826.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/43509325786.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d24dca1c65---44765152177.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4a363d29---zemafujenogawufoku.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6c20ed51741c68aefb678855c3fc00b6/59404222630.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/19588042678.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4ce8bef14bbcd50328e01fb51a0b98f5/66034320141.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071973272e2f---wixulupoxinipokesesanisud.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a9f6c1ccabc84b7b870341ae835b2720/62090915171.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae782e337---94831509518.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/69851258358.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/rokilivovez.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090eeef59255---fuselasofosurerewigolem.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/787euh07t6qi6ql28lt9i97s55/26132643440.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/jujugeloboz.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/61432194768.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/38117108185.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/58078595905.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_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 17424 bytes
SHA-256: b12f8db7624dbd3264f9a09684b00d0c340261a071c2777663fde9d348ceae9e
font_01_sfnt_off00012aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C5 10692 bytes
SHA-256: 074a4651806b5da991b390989f58de13facfbd726c4a93d4199db6d732dbc2d4

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