Malicious PDF — malware analysis report

Static analysis result for SHA-256 0381e3679b0bfd16…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 22:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad92ab44e6de7f0ea66ad1500c5543ad SHA-1: 483531e65b7f9ccda30ee5ca1cfd944744eda759 SHA-256: 0381e3679b0bfd16d9196fc8c0ad966fd21aff437e2f00be0d3b1c80ad1fe3ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript and link farm structure suggest an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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 http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107d899c29---jomun.pdf In PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/xarikewagivofut.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hmvt1s1bkitu6p50f81sc8dpfn/93347862723.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/derapimogika.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/28221670968.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/74353894763.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/90144361139.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b42d740991e6c8180f691ea809d1564f/74096168026.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/nutaruwadewud.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076d10b44b58---zojaxusenogimuxu.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/ripaporilanufuwaxo.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/gonizawivorotigesed.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/ridad.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/89253064979.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/25072056323.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4ff8e27c87fddd40b9e4d9103d03b5f9/karejudemura.pdfIn PDF document text
    • http://cichanski.com/Upload/file/72884638748.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/d8ifq3mtq8muh68m1a7b39c316/rufojatazeze.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbb3683df---27287528730.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///lutizakusowerezazurozefen.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f92vttd5rfaf01u60db9ihakt2/92634149079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=amway+business+overview+pdfPDF 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_off0000c18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18E 11000 bytes
SHA-256: 171afdfa07a87f98997f900ba411109728dad4a40d6f6d6d1b7426c1e9a29902
font_01_sfnt_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 16688 bytes
SHA-256: e4d51921a85090673a1b0cecdeff645b905b474fc395678a400ca5d36372617a
font_02_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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