Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0b90ce86fab63f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 17:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6941abd14fb9d7859b1257fb3e060a47 SHA-1: aa5d79f97d646cc6c023743231744df5f8e86df7 SHA-256: 1b0b90ce86fab63f5107399dc854df692088aeb802e20540b3208eba72142683
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of URLs, many of which point to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to one of the listed URLs or to download a secondary payload, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0c4224847d56b5fc5dd3090f3020ccdf/37725534791.pdf In PDF document text
    • http://lightofislamonair.org/uploads/files/vowowokoxobovafev.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/7128094833.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/ximozevelevexatole.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/26055518483.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2f8a6161---regakidusiwitunoxigo.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/40293227911.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/97184463547.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/86281622950.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/12091392042.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/40193707121.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/19760431987.pdfIn PDF document text
    • https://hinaweb.com/upload/file/39116536812.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/xiwirifida.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/matelijuxukabopi.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/vuforojulawe.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/vugemomowote.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/3158508812.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/24222916754.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/81419613510.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/duvavixe.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/bugifi.pdfIn PDF document text
    • http://theponghop.com/upload/files/kafodilelomemituv.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/faserewuvukaw.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/koxelebopulodepap.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161415efa266de---53319254245.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210901140957.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/fimese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=1+click+installer+for+dream+league+soccer+2016PDF 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_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 11376 bytes
SHA-256: b409493880a8782bd8b3946362a56ae74d4eff79cb23fb99f1f5fda099383370
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 18492 bytes
SHA-256: 01e6bf2892cae499b84c7f6fb1e98c170342819ebe0c36bf11654155bc1e20c2

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