Malicious PDF — malware analysis report

Static analysis result for SHA-256 926ae5b58c1c0897…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 20:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e504f108d68e14cab312fc6d985ae07 SHA-1: 94396f775de8266bfcf478a14569c45f2737924f SHA-256: 926ae5b58c1c0897c5a55f9462c29195c31f8e68855f0c6731bbbe7f0d541f4a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and compromised CMS upload links points to a strategy of leveraging potentially untrusted hosting for malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/21478cd6bbf591090ba5ee70075957ef/kajotodugobav.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/diforevoliligibaja.pdf
    • http://www.psyforyou.nl/upload/fckeditor/file/46077391003.pdf
    • http://vers-ma.de/userfiles/file/jogofodunusifigevopa.pdf
    • https://satellietgroep.nl/userfiles/files/69899415588.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/97df58d622993496b595f27c00b74cd6/kimatesufowataronelusi.pdf
    • https://ferest.ro/imagini_ws/juxoxaboluvux.pdf
    • http://wisdomtours.net/upload/file/1309007285.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2ilkhj450kac7edct4272sss75/fimukebakoxigufavoliv.pdf
    • https://kimcert.net/E/file/51965564184.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/peromelowekivexaxejitupuz.pdf
    • https://pmms-online.com/assets/file/donumifidufejiwuxaz.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8c7682ad3c80a5726d7fb1238e5021dc/nesovaf.pdf
    • http://orikon.net/Images_upload/files/nerililemogajarixit.pdf
    • https://amrapalispot.com/userfiles/file/62376245199.pdf
    • http://pilot-market.ru/new/files/file/mozofofi.pdf
    • http://facyt.com.ar/ckfinder/userfiles/files/jazoxeripabodanaxode.pdf
    • https://dadesigning.com/daduserfiles/files/webonijijabizikutapirib.pdf
    • https://radiosmile.hu/upload/file/37976012383.pdf
    • http://panel2conso.com/userfiles/file/guxumusalogejatarakux.pdf
    • https://zhongzing.com/uploads/files/202109070233182836.pdf
    • http://elisa5888.com/shopadmin/upload/files/1458136495.pdf
    • http://eurolocal.info/sites/default/files/images/file/zadenejoz.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613878dc8abef---netodapi.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161391963431aa---10903894941.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watch+harry+potter+5th+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 16792 bytes
font_01_sfnt_off0000f0c2.bin
362302c0e7865c5ee4d267c1552d28d11b7bd7b800dd551dd3ef58f77d2e398d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 18524 bytes
font_02_sfnt_off0001207d.bin
3c2b1ed7d5b68b6dcbf457a059ecf4727772cb63c741c67b46fbae3320659303
pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 10628 bytes