Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7b9730eaabcb47…

MALICIOUS

PDF

95.2 KB Created: 2021-07-14 02:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b35c5f1470042386ac76969c0fe13c1 SHA-1: 25b21d0e7f5302779a0a3da0a56220eba8793498 SHA-256: 2d7b9730eaabcb47b40e7410ecdaa9a382ac26511182dd45f151edde8f91e6e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://synerhu.ru/uplcv?utm_term=top+10+would+you+rather+questions PDF link annotation
    • http://roland-toys.eu/userfiles/file/fazowukuregu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b94bd0d27---32369699058.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/wotigenotupadebiwoduvul.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8753f9df95---zinitivenagip.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/mogemajapinomepewarojaper.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6b8866c99---tubuponokasejuvoturufifo.pdfIn PDF document text
    • http://sushi-belovo.ru/files/3489374943.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95d50cbb58---45390712076.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/2634609719.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/5ghc320aev4okisopb2s54te9a/51848038650.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/33288617453.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7affcc643a022f95089083fa11fe52e1/85561290561.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-19/20210619181740247308.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/35495994481.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/nuvedet.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/e871g0246bf4a8888on06r973f/rasebuxogisax.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/28274172795.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160917d7d43707---bawiditinuwawito.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/losizodarirafesiwolefufik.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/j2ieqkuog9aduvu4ms7l41q6oc/79362124161.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zofatopujano.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/pagunotudegusimuketafa.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/n1utn78b429ca146lgg8l5bo85/97697211585.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/80820391398.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_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B20 16528 bytes
SHA-256: 10c9462e45e225c9b61653d3c98999ca5042539f792f0c8f1e011982e1ec47a8
font_02_sfnt_off00015611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15611 11072 bytes
SHA-256: d504a6ae31bd6a63218ca8b936d38e82ceaa144a3efecf49b7e51b15021620fa

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