Malicious PDF — malware analysis report

Static analysis result for SHA-256 3370fe277562c47a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 21:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7848060059ca9bfc8d82082fa217a96d SHA-1: 4b4bc69bf6a635453ddad8c98473715ca20a244d SHA-256: 3370fe277562c47a58105284dff705c37a76f77d1970f436821d627cd3b2ea5d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on compromised websites. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143618a8fb06---47254008271.pdf In PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/45349924298.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/wedijuv.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410e02b0596---93663016229.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b71eb07e65---pinona.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ef941cdae5e3b1445b81b9cbdb5e6e07/36130274532.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/zifirexak.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/86858285721.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/33885ac5102c3084ac6148b5fa577050/sanavawe.pdfIn PDF document text
    • https://jss-moms.si/upload/File/988994985.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/43679497326.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/gotilenutuvemasemes.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/25561053634.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/60325936815.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/tikonivifewuvisiliwuma.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210920222715_2018464648.pdfIn PDF document text
    • http://salonrowerowy.com/userfiles/file/49625855697.pdfIn PDF document text
    • https://sainaudit.mn/File/lofomejimuzuvuxusema.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/vixanizugasokubin.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/venum.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/79193650253.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210923_215410.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/57007249211.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/34117211096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ai+type+keyboard+pro+apkPDF 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_off0000b0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D6 17736 bytes
SHA-256: 76091c3147c4ceb4d360f7c748506620b74a9ae755b67443a6a0bb000c4adc16
font_01_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10396 bytes
SHA-256: b3a06f9af9e6cddba408c459f3a251365d359553c66338ca440a957135605684

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