Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b586fbda9464f4e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 16:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1376b7bd28043fc6c087a8391c64941 SHA-1: d7d816f0bc52131084e4d8d7fb342eda17e5537d SHA-256: 8b586fbda9464f4e2dca09f3cc1f09926522e8931e6a90f59985dbb86b486be6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=santana+europa+classical+guitar+pdf PDF link annotation
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/lejawogevotimazek.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/28746927794.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2163e64ac---xosarozoriluzenuwifali.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16095d658ccf5b---sexumizawuvivanigo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/0o3hm4rhrr2fmk5cjp9ajl75r4/nuduvig.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/vilowovopufaguv.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/81353767166.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/97fjadl5to1863qje5j026gcd9/lelafulakewisiwomep.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/mogiweluzobajerofupib.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/1203886649.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/55876675430.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/j66kabusl2bl2m5ptao4a80u6m/sipizusizezenozuzovorulub.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe5ca06d41---wanarupepad.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b7819fb903034e2dee9531fffce6f41f/jerutajudorawonu.pdfIn PDF document text
    • http://rsst77.ru/upload/files/libuxabimas.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/83784972200.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/viwesaninilugefene.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/86626170301.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/dizobinosolibulikunapavap.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/jinewasagidonopajexuvoduz.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/3790948861.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa601ddce9c---vugaromegalen.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/97083837672.pdfIn PDF document text
    • 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_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 10972 bytes
SHA-256: d2c11e51420b67e3114c76726257cfed37688046183b2b954e76e5d8a5d287ce
font_01_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 19784 bytes
SHA-256: 2e0a2eadd4d01994eec5468253eef4cf14a3f9dddc9a6fc1558673d999514143
font_02_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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