Malicious PDF — malware analysis report

Static analysis result for SHA-256 20776efaa7a59d17…

MALICIOUS

PDF

81.8 KB Created: 2021-06-30 22:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e780af953a29916ab1792994d8fd495 SHA-1: 12a6e78769c352a7ebd35986138a52de0be0703a SHA-256: 20776efaa7a59d17a7471fec334325cc4f153a3b6306d6f5c37af02e81a588f1
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users. The primary goal appears to be traffic redirection or potentially distributing further malicious payloads through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=the+first+book PDF link annotation
    • http://petra-dario.info/upload/datoteke/38628521788.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/10c26a1e439da6e254569f425f6ac190/dekovali.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/878ba0bf0ff6d6e5198c87ff3167fe68/78505425858.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/litawixokefefesodoxuwu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/inor92cudg10qkl7ehr9r60noe/72602073898.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b28328852---33733011894.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/47e8a06221677a162a708b4fb5d119db/92009574820.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/80528207542.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160900fd57361c---47969436969.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kebirulakisip.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t9unairt0vpv7pak9ngjp3tqql/7673504256.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/vijuxizaxewep.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/diwejef.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/bisoxupu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7fc4fe3f731639e6e2c0801ca4c43ffb/nofofebudevodebi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba3d80d7b4---39047697793.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aad01771b---51386462523.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/fidilenafole.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bca6b03558ad7d365949457d96055c3b/7295159551.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c54bb09e587700e47470c3d2f8197d4a/77073926284.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/tosik.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/45247382935.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a752b47341d---dulamasimuvusi.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/eb8d5d4c4b0b75298fe71dc76d3e3740/15053729545.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d65ae1f41---jipewojaseni.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_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 10192 bytes
SHA-256: 84f5f99b6dda56b485b497fc62bd4f09d81828b05ad5976beea70bd49ba242c7
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 17948 bytes
SHA-256: 371e27af4c97e40b19f63577072cde1db51832cafbf109d41b8f610dd68b2f4b
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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