Malicious PDF — malware analysis report

Static analysis result for SHA-256 692a6732568aa86f…

MALICIOUS

PDF

86.9 KB Created: 2021-07-19 10:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6516592906b0d62e2cdc6e26519f56b6 SHA-1: 9b83d64be06713c70fdd0c25ccf2a860c3fb042e SHA-256: 692a6732568aa86f058c5023ccc4b1a6f61038777d38712d0aaf6769bd40bff2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other domains. These links likely serve as a distribution point for phishing or malware, leveraging the 'link farm' technique to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/st799m5e4g6psru87ed02dq6l1/rivegutadulidopulogi.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/ee88614e517d865326ee9dd2d9d906f2/sutefiwimidovavogosaxipo.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/lezutiwevid.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bda2715c3bb---xujeragarumajok.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vhev0o1scdr9qj4qke2uljadlq/wujadapazuguv.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106191228.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/mufupegezufisawolo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c0583a6f300f32b2b83bf494339117df/25541972014.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/402c292f7e42a2ec1b10099adaadcc8f/kifabemob.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/faxibosabovezuvubomi.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/kenurilugetaxeref.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/21765169432.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210629_27FB060F21D9714E.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bba04676cb4---90300472167.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/k0h71pup2quv23156e63fgbenl/runidigonakevajodofo.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093f77eda87a---26153553279.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f80761d994c1c005bb5792328389d1d8/rololenakorili.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/vefuzidelepori.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210619/file/tutegisituwefunorezawux.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/73241875142.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/31203781902.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5cb00f39---35534208948.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/gc83dagi5o1al7nv7k6437pd85/xigakuvepebimukenip.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9af5eef86d024d4e4236d66a9438ae81/lepaberoxuzukalir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=olympic+games+1936PDF 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_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 10992 bytes
SHA-256: 88b7df56dc855a3960d73d93d3d30a021de8acf65d38ae0904b10ba59bd3296f
font_02_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 16648 bytes
SHA-256: 693339bcff39dfc37634ede6077ccbf83bb6a2a5e3207f204a362b3d52eb971b

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