Malicious PDF — malware analysis report

Static analysis result for SHA-256 3770debb9adba24f…

MALICIOUS

PDF

88.3 KB Created: 2021-07-07 12:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2bc2a51c568874dec9f0697e7226fa78 SHA-1: 5e22cab8cb57b68796da3415f47e49490605c359 SHA-256: 3770debb9adba24fa9cc639feb5cb9532915bb1d3d0655129b5a72f666bbef8b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, forming a link farm. These links likely lead to further malicious content, such as phishing pages or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://alarrabnews.com/images/content/content/file/84736260052.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8354ca052d6c91a729389cd5fe019d49/bijilogoj.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/55509510990.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9996b2369e---8180314956.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec945de884---95777136967.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/79933394004.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b91e4e354bc31ed97e37a1af3104c632/77419368024.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf482d86a8---dikivajusaxi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a7cp72ssgas79al4vkikonv75/jarabibizuzederenisexosu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884f08aedcf---nukizopin.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9ddd1c51a9ebbf18be283f86018e7757/sonanarosidubarixobumaf.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819cde0d6a9---luwaxitakegofo.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/47984945449.pdfIn PDF document text
    • https://susta.vn/userfiles/file/27130510134.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8037a453---bekomiworenetixatelesos.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ec82c3503---pabowakoz.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e526518959---pidegul.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/96b97301cb7f2bb604d6336b5dfb4708/sisuroba.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a67o7o8ie0q5i2e09a6hquulga/lavadagekojirixavigi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072662658e49---38053643209.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5f7c1808d46bbb4fe5ef5a69f5b3ebd5/84233507521.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/wekidizafa.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2bbead412145a1ca37be80311005ebc2/2996440481.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/96903879319.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/78123784052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=doubly+fed+induction+generator+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_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 18140 bytes
SHA-256: 7582a3c7b5def2cfcd2afb4675bd998e9d97009792df8e0cf16a56d8282f302b
font_01_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 10980 bytes
SHA-256: e9a829614e80c9b8efffd6ec9e41c4823fbb69092129e42f20c70b1385417a59
font_02_sfnt_off00013b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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