Malicious PDF — malware analysis report

Static analysis result for SHA-256 11499134d45fc314…

MALICIOUS

PDF

67.7 KB Created: 2021-09-11 21:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24a288a18ead1aa6324afd575176ac95 SHA-1: 4a7b19333c14f18588a37cb55859782e48042d0b SHA-256: 11499134d45fc3146c0b3b89ed9393a8d901e50d8ed0e3636448ab31f02291d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute further malicious content or phish for credentials. The presence of embedded URLs and the nature of the link farm indicate an effort to redirect users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.pibmg.com.br/ckfinder/userfiles/files/files/36029396765.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0ffa2cf4827b7beeb50e64b084dacf5d/31288912962.pdfIn PDF document text
    • http://machulski.com/public/file/lovinosizejesagok.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/40374545731.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/1972660820.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/sofabuvogoniluzidi.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62965059352.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/xebomelezuvolomegivagis.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/58499471839.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/tiwepalabatizudulike.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f74309d4b7---47639718956.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/palowudanevu.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/limukiruvoreni.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/renulawepepisot.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/3005274636.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/zagojufijirageg.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/01182bae9e831417fa05534a877c97ae/50045886156.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/towajusavusigibovivela.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/malotazapixevibopenomud.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/taposifafarizika.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/tafikonomo.pdfIn PDF document text
    • https://scalping.ir/data/files/file/bukadoputiva.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/43664311171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=avsar+app+download+freePDF 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_off0000ae16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE16 14308 bytes
SHA-256: 9121e02ea44bdac63ecc1f0644b666d63c5ec8221fc0486ed29a3d263c0eacd5
font_01_sfnt_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 10432 bytes
SHA-256: 4eb7f0b8d3cca2610c1f99dd158558b3ce173205241ca255886a1a864b6ee4ec
font_02_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1