Malicious PDF — malware analysis report

Static analysis result for SHA-256 b974799abe410e38…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 11:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67509378b2b5bfa92b93ed65ca4c4922 SHA-1: 170cdc6c23e02867483717d5b901a24946840d14 SHA-256: b974799abe410e38aa6c7a6735daa5950aab786b8ef449824e27b02343ca704f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this is a link farm, likely used for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607610edb7531---koxoxadapaduw.pdf In PDF document text
    • http://wadsoda.com/UserFiles/File/ziwimudezumipexivoba.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ngtuvt1bldd85tu008f6pnlgec/10228301420.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e189f6775e6558d9fe47d76b4f6b3c3d/vufolatifevobafi.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/xenabosomoralasorugameda.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/bebusiteresupoxeli.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613478da894d0---zixanidatotekisubum.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9d9e434fdc5f6dca80fe3e119d983611/13420353826.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/xalomi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b31095baf3f---tamopodufi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c1c033d98d0ba236a2d0fce8d25b53c6/ruvasabimevomokofotep.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/tiwobikixupogix.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/40915705876.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/31860773663.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e8ddcb8501b0aaf330f1e89b60fbdbd3/jodefakafopizovadatuw.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/gadatazaliromoxanikiw.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/nipevogapatikumetuv.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/94722311275.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/tijapiwodazazopewovexefak.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/i8q625ikf76s0ineq30nv9bt8m/14878969791.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02d5d9b83---12005032962.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0d5f33f41740cf6473c90667fc8300d8/73997194206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rgb+color+chart+pdf+free+downloadPDF 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_off0000ba7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7C 10912 bytes
SHA-256: aef26b023c4341c967bfd9cfa56d154a05edba9ea72ef6e0fc97e143072495e5
font_01_sfnt_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 16844 bytes
SHA-256: 95cfb641831d0e95c1d0fc444e387ef3efa0aea3f0b7e8ded73bc4dd93c9174c

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