Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b377b91526760b5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 05:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e793641afe5ee6e5a1a05cff4abc127a SHA-1: 220f25294cbabfda9a60b28f204d8cce9329306d SHA-256: 8b377b91526760b589d6c36d3e3ce69b21e8018f23eda6b04d9df4103a40e8dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://foodsafebox.com/ckfinder/userfiles/files/fisujafeliwunurojeso.pdf In PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/sipogebofibemowulom.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9d5ecde45ecddb2721ad81f78f7673ac/vuwoboreronizukowupize.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/86c0a9927e773edb7a869ab152f8838f/8646089167.pdfIn PDF document text
    • http://hotechike.com/files/files/batanipalawuz.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/53973418222.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/92433469726.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/86627507721.pdfIn PDF document text
    • http://proxima-design.cz/files/file/wurefijemixe.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/17275126032.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/31258305403.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fe6130a0---62769289680.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/gozusuxigibateziv.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129e0c63b2be---keritivusuzazi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a13744af5f952403fcba630c325ecf58/bapupumezenuxowo.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/kumuvogewe.pdfIn PDF document text
    • https://immobilgold.com/file/75509832641.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/45933851029.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/86950217455.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/pagap.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/79db2dolbr795nld83kl6g71ih/26689678077.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/6l3lced67k66hfjasnrg73k91k/97843325799.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/88987408527.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/puturovonirijinif.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/rokolumaxixinu.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/rodowovirebivimesapupawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=juego+de+quimica+mi+alegria+3+manualPDF 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 19988 bytes
SHA-256: 4b2e8d965229fcc9449a68d39b39b56a8db67fdab7ff32cea750f9757046d198
font_01_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 10856 bytes
SHA-256: 5dd78efbdeae8153c0a27c776b4b01245bd64b199a6a6c20c89332bb473145ef
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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