Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1a56505db61b2d…

MALICIOUS

PDF

85.5 KB Created: 2021-10-05 07:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d182574a050e96a2ae09a0c92264cbf SHA-1: 8c5827d29266ac806d712b4bacb06ca2ad6df699 SHA-256: df1a56505db61b2d5c88dac38ec0308491ea589e8a8b358805b11f903e564ef1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely intended to lure users to malicious content or phishing pages. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8e211f62---badeximemasuxebodufa.pdf In PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210905_2C03960EAF98FCAE.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161401f799737b---fufirilulezujapo.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091408385173499.pdfIn PDF document text
    • http://sjanzee.nl/file/velelejezad.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/35611636960.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/lixivakinavakufipo.pdfIn PDF document text
    • http://rc-modeller.se/images/file///keridixe.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6141b3ce301d1.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/zotefidaxejevilekuzuxuji.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/du0ec1avps92fe9dcdkffr50om/12239177131.pdfIn PDF document text
    • http://camonetinternational.com/files/file/savulakisaxumu.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/nuzipuvelafudibivu.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/xobifesawukazefoxemelixu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/dav2fnsfqdjgcvoknc5jluhgp0/gulipimedewex.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/59205839078.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/kadisezisudexovap.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/latofavuxaxifemetap.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/zosupuvuxemamowekekoga.pdfIn PDF document text
    • http://techmechengineers.com/uploads/nubonozedonevuxo.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/32985955330.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/janerovupot.pdfIn PDF document text
    • https://ags-car.com/upload/files/51836980087.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161573e72a3a77---ligifisavajutazikeduzun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+remove+last+blank+page+in+wordPDF 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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 11112 bytes
SHA-256: 060dad5c4d3abc4b0dd80aba5462330328331352549d4d290fcdbac3a1213b4c
font_02_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 19320 bytes
SHA-256: 82f5ace863c59c4679b5ec842ae640ff60f6de362a3e781bd74c03defda943d8

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