Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c4d7f27d868dc1…

MALICIOUS

PDF

87.5 KB Created: 2021-08-10 03:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82beb991af5e4411981a932ae1bb1013 SHA-1: 6685918ede8d96799bcdedf02dcc0a437869b76b SHA-256: 51c4d7f27d868dc1199dec9b73200afa104d766f57cd56074b02f1fc3481409e
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ajwatravel.com/wheelmarine/userfiles/file/baxunuxefejinewidopevom.pdf In PDF document text
    • http://euro-ex.net/images/blog//file/dovajaredigezu.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/5e4d2540b21daf7d3217e1103a0655c9/visaranajedolig.pdfIn PDF document text
    • http://gptools.net/userfiles/file/legalipelodixozekunojis.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/tevixofodigi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160addb30e9f94---42433774693.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/xunimijib.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/23ec80d63a0b19309bd612b56025f139/xekesawidezumiru.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/73910584247.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4794ec0e---bazusapetofeg.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/142012245294.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/jrj8spqcgtm4l3ahn1hj883fbb/69115349241.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1be8748567---fopezivudubusorapix.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad8adb5a5---juguxarevidodowuru.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/8ju48qv7korvcd52th0jcce0jt/32612893572.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/lijavaduwakobukibo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/e4eea3tvpqm41pfpbrrq7p83j1/91108552745.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/magema.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kcr5na372q8d1fdk4vq5ah15p7/4105232380.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160868110d15e1---zoladaneva.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/q018p9crvaq43hdmfau4vvmvrs/ludirorukidituzawu.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/masoxifomujulomodez.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/81869963415.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/895a49480d66d290cbd6a9d3b135096d/47584295464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=handover+report+template+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_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 10436 bytes
SHA-256: 6e7ee0c09d66084ea445d63d042f196f5f5459abbd198fae90ab20e8a979b209
font_01_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 16844 bytes
SHA-256: 762e85d45beb4533074ade120fda675f28addb972cea86eb52c3aea9492be121