Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdc5081481ab9dd…

MALICIOUS

PDF

100.4 KB Created: 2021-08-06 16:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46c5bff8cc76ebfbb68010c2b94ad0c9 SHA-1: b59ce8a333c70770b48e806408dc3f23afa0ed0e SHA-256: dfdc5081481ab9ddbb212761f1c180c30e047ce48b4acdbe2785930a5f1c1c35
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://catamma.ru/uplcv?utm_term=what+food+is+high+in+fat+with+no+carbs PDF link annotation
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/bde5b82ef0292c7039263783392dd981/4230075702.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/xavenofovixupomajudakin.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/aog3od4eqfqchmmfuf65t4negq/34028322307.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qno183mpqhnug71faosak6car5/bivuwefuduwegizumu.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/65863048794.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fddc84a57a6---92735682454.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/77339658444.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/91762886112.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899ffa8f56---defesise.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/suripolivel.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc0c4f526---tutademukas.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5aa2f2e837346d257a7601c4e7d659b1/wosujodibaxivoletas.pdfIn PDF document text
    • http://dakmet.pl/upload/fasedojosomufiwa.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/v4l1daa2lr5em6dc76ov1c6e2m/nelutula.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zerepitawikobojipusupeses.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1ue2t39rg1soihdasgv7p7ktk2/34293726806.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/24d5fdf7424f11e1213d16483b67894a/gudej.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/48027915985.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/96556750413.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/kebum.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160839af8e1e14---36783320905.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160783022573ee---dirase.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021071403493670554.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/zuvukibumuromuned.pdfIn PDF document text
    • 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_off00012591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 17328 bytes
SHA-256: febe5deb472e0247fa634e0b31e77720196392f582d395aaa2cbfa56d7eb62f4
font_01_sfnt_off0001523c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523C 10796 bytes
SHA-256: 82975258f14a1d76be399375b0bf7c0f76d6e634dc17825ea6158b3217ca5c0d
font_02_sfnt_off00016aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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