Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a451284a2d460bd…

MALICIOUS

PDF

70.0 KB Created: 2021-09-06 00:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 084b2f56d4d8826f7cf1b70bfae115c2 SHA-1: de5a5bf38524affca4946ffc5eb9e496b7cb095b SHA-256: 4a451284a2d460bd8097f691827188fe6585d55ace164605870e9aa4625d9cbe
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://barcelonacentromedico.es/files/galeria/files/guvagesepate.pdf In PDF document text
    • http://oilandgaswork.com/userfiles/file/pujubuguzareriluneb.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf69eba6c---rabegovogefisumevapun.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121af685b692---13064380672.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/zutaxawodiwobetakul.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/xisifed.pdfIn PDF document text
    • http://rilta.net/userfiles/files/janev.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088735d0f4b1---weviladenemejukuweka.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/pakutinuledidomavavewama.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/pasomugewukukukeso.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/91224426917.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/14943112502.pdfIn PDF document text
    • https://virker-ikke.dk/files/98905869059.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/bbofi3umf9n61auc1bnbjsi6v6/puwitejoxowilega.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070fff721da0---roxixojipojopad.pdfIn PDF document text
    • http://allycatering.com/userfiles/fuvezetoxa.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610956fb9b917---47985620783.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/efomj3b4hjvdmq2rr4i60frjt7/10654899805.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160de1cba8ae60---vimujafonaguxinoxew.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/liwokafimufitawabif.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/naxofusiputagine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=never+enough+the+greatest+showman+piano+sheet+music+free+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B3 11248 bytes
SHA-256: 893f5e005d1df2aa7b4410c626071685081906f14ffca53a2078278f0ff38429
font_01_sfnt_off0000ccc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 14844 bytes
SHA-256: d0a4918bdd401c27847676c767880d7cfb8369baadd9e938e2bf6663d0f5a856
font_02_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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