Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dc7342df1830c7…

MALICIOUS

PDF

84.3 KB Created: 2021-08-12 19:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2c7bcbb4fb815e2e94268a91be0fdec SHA-1: 4217e7e8280f20dede2a4e8a616a582b42d4ddf6 SHA-256: 53dc7342df1830c7fa498220f4f514efc8341c1d91c2f25267b2c419088cb1fc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL targets suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wills.sg/wp-content/plugins/super-forms/uploads/php/files/415789a8d32e7453a43065e66102b8bd/mefusur.pdf In PDF document text
    • https://ukmalayalamnews.com/userfiles/file/witakodofekifijadapegu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/e5p301se7o5mla6okmkcj8l1eq/97470379792.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/480a1f663f8a3ef7e37b43fad47eeeab/78641701668.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/68031410788.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/908d6bbf0e0c1d34b93211df0e0ed6f9/bitotumefibegolukerepozo.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/18153655306.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/wexibutuwokanuf.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/kulovoterumiza.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9acb4182---76266573383.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd11819537---71608212692.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/nukozaximemuxodizivov.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/fofexewatuwewoze.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/gajaponereduvo.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608369fc3c2de---limuvobari.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6abe6f02---tolimutab.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7dec532fe11ce0b167e090b2164d877e/91400413205.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/92974533049.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/37921265741.pdfIn PDF document text
    • http://askort.pl/Upload/file/wojuxiladikokawagixib.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/giliresirabajilafevet.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/bedutowumexix.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/sozenegegow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=libro+de+matematicas+cuarto+grado+primaria+con+respuestasPDF 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_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 11008 bytes
SHA-256: b01f2563cf0a985e1228fa941537715b4787a3dd404412e1561597de51d72a4f
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 18692 bytes
SHA-256: 0301a0868a4532912175980abf13534e01e1bd370993426716bcdeaac6263b03
font_02_sfnt_off00012849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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