Malicious PDF — malware analysis report

Static analysis result for SHA-256 882f8a2ce3440d38…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 00:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ca1a7db05680619eb5e934912adfc2d SHA-1: 18e05ee53c28d7217830dd0cc885c860a0369723 SHA-256: 882f8a2ce3440d388c5ae2c3fe8727c8fe8cca07ed4bb3b2722cc3d697f6884a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://splogservice.ru/content/files/zukarowodamuxedi.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5oh6er2e0sgesr80tqeqjhqt22/gefodozakov.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/55397218651.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dda49aa2c---vesugavag.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/d02474bbf53fcba2c2b899083b2961f3/repibaxugekukukagi.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/14143912345.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/53804270654.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41141f7a9---velujuniwogixerab.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8389bddac---92230893046.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/ed37bd97d0fb1c3df5f6f38989760429/gasedepalawu.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/58205548786.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xedexovewi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083016463fd2---84037579673.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/76627082637.pdfIn PDF document text
    • https://mytopics.it/uploads/file/dakoluvemok.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/dodurilixesowazu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/0iob7d05je8b68amme04q9ia93/90059125996.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/995c6be3bdce57ecf00d815759be9c0e/melefemilapavaki.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/22839890683.pdfIn PDF document text
    • https://optical-axis.com/uploads//files/202108022301519556.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/xonivaf.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/wojegutitizevafuduro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=verb+english+conjugation+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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 11236 bytes
SHA-256: b476b145449e1084b93ac99f0ea43b0b5cbb03c25ccba68540703e66d8745e9a
font_02_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 18732 bytes
SHA-256: afe8356abc354cebb1954c8247bdb5b8cf79a91a918c450a92580cef869eba95

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