Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33f3424b7ec0065…

MALICIOUS

PDF

91.0 KB Created: 2021-08-30 02:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41d9f9b9eca18d18f8a43c0bd6ad0120 SHA-1: 8eeabc9e8e304f2380a0746ffeef055180202c35 SHA-256: b33f3424b7ec0065b8bbb86b06beceb5cc7aa8c878fb64f1c316e15ce38ace72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or scam campaign leveraging compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://savoie-outils-coupants.com/ckfinder/userfiles/files/37512496807.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6d17cf0bb---wipidufodunurewalif.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8939a3f54---20926881460.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb156878dc---wavovogoziwij.pdfIn PDF document text
    • http://yuli-china.ru/d/files/tumotajow.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/jajiwilip.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/selerobetimotejivu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8674caf8653ef01fca48826b845c4049/14843776085.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/wakiwonokipir.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/kabiku.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec3249798f---rorefuluje.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/tisawa.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b86387457cd---paduxifozazinis.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vakatelozu.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/81051610702.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/xatitenupoba.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/45641382488.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/86132714493.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/20465700208.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/goviwatenunigupizovib.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a6cdaaa021d---jarurolosimisu.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/gunobugexevufuzus.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/81739786609.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073aafa05ea0---japenuvikagezofu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/malavexemivevozupod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=importance+of+family+in+pointsPDF 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_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 17316 bytes
SHA-256: 82c6a996bbc1256266a50c7e701ec5ed5d858246cf9dfffd2d62da2173676b89
font_01_sfnt_off00012da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA8 10704 bytes
SHA-256: b0e43ccbeccb1d1a07501cb8f888c33ba710915d6b7db57915d6e6e7420059f2
font_02_sfnt_off00014639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1