Malicious PDF — malware analysis report

Static analysis result for SHA-256 75833899f7d7fa3f…

MALICIOUS

PDF

87.6 KB Created: 2021-07-08 03:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 609e6a8b1b403411bffbeb73729f24ed SHA-1: 03b4acddb5bf1ff66d646ed165c23f68b6ee7365 SHA-256: 75833899f7d7fa3f448abcaa7a60cab4f40f8ef403f77b33efdb638b5c07487d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/egfmfn68qvjcbl6bua4e2qq9r0/41929729418.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b595d20c0726633bf4b61d8914efe6be/nadurodufoxagugeka.pdfIn PDF document text
    • https://limsurdua.com/contents//files/bawujofum.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079838cbdad2---57086299896.pdfIn PDF document text
    • http://hodori247.com/uploads/files/85530370632.pdfIn PDF document text
    • https://plasy.com/uploads/file/basep.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ckfvntlrp4frd69t0slrecbl35/talufurufobopexibabevabib.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b98231a96b8---16530809360.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/kvdlt7rgena4u3i9b0qcnovur1/wekesubajerobutegesu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fe4cfd678d480aefc324cf47f86b3822/gitud.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sajivumiwupetive.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/depawojupixiwosujozojamax.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wawiwi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4r2un2dfuhhlfa13uain6e0c1k/84044643103.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3bade12138d379a08effab6270eef861/80473212323.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/lixokoparazolubakulaga.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dusodipobukemozetedeku.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30e69d35c---fumofolitijojogefojufiduz.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/p2jr7ve9ce9gufcn5hdvgpdha4/637161425.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/gojokabobowugud.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6j7l2lm4tohcmool38oqiacuu3/80859652062.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/xevedexidabigaxopa.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021061701113092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=find+the+answer+by+taking+a+picturePDF 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_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 17488 bytes
SHA-256: 1062f94b3a62cd7ae3022c1fdb92f98cef1f10e9fb09fa8a28420d98971a4048
font_01_sfnt_off00011f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F55 11136 bytes
SHA-256: c03c8b1634771741bdbcdf06bf66861b1312716054e55f9fc7390a6cb61eaa47
font_02_sfnt_off000138ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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