Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0dd97bf554e7426…

MALICIOUS

PDF

129.1 KB Created: 2021-08-07 18:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b33a29d806c887c535b2d95f9127abb5 SHA-1: f80a33a1e9c790e7377b1157a49efe9f421a1f72 SHA-256: f0dd97bf554e742671fd6c53b83efe0d71e0a843b1289573bc5c0e0637b02fcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5083390fd5---miganuratuwifugidezibut.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082816d00317---30036249770.pdfIn PDF document text
    • http://belv.ru/userfiles/file/65649471700.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a22b89bbee0---mewazezesono.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa212ac812---66429698825.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/dovepu.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/zoxapiduv.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/nuriwud.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608929d56e26b---44555973432.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/veron.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/bogotagidajutagafurumaduk.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/55670595e5c06f557943fb0aa8255746/7570946450.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/kikofogonok.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e46e3a27c---nelizan.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/36408617683.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f24b2621c5b8a95926debdceb2061fa5/bezokazada.pdfIn PDF document text
    • http://llux.vn/uploads/files/41404861248.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/tupazojefo.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/xivutulodofegunopubesadog.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/gobed.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/fevuvawofojajomibite.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/fetazijirupu.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/2928414845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+helicopter+in+gta+san+andreas+androidPDF 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_off000196ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196AC 17692 bytes
SHA-256: 59c0a52c2e06d8270f06170b9437581a1683ea53ae08898cd86629ad0f7ba106
font_01_sfnt_off0001c4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4D1 10872 bytes
SHA-256: bc8ad36100ccff2ba9ef606c53b455e2d2f2cc16bcf99967a0e960c4816dd95f
font_02_sfnt_off0001ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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