Malicious PDF — malware analysis report

Static analysis result for SHA-256 f520d51ee2e80498…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 05:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6cca7c172a32f5b7baeaa1ee181b5121 SHA-1: 05da1bf71dc9e52770b1075dc9bed8b21caffd85 SHA-256: f520d51ee2e80498a768be4c855d64b769902c9a0e8d9542e94ab7393d8fee35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links to potentially compromised websites and disposable hosting suggests a link farm or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4reapo2dj1ed4bpeojhc09bop4/tupifawixuluw.pdf In PDF document text
    • http://attlas.center/userfiles/file/bumesuvabove.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6aff1c5766---poxoses.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/91144926209.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sevoderubofimowupevedajuf.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47633025a1---4349987383.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/73836534122.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/89927292753.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/90679891079.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f236c08b39d---tipulotulelub.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612368f8ecf4b---sodifexijisomadinim.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/zajumowuzalojujujevew.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/guwapugo.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c114782d8dd---72669053355.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e49d7e42b5e---10578236059.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16118a9200dc70---fulewebu.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/xusawikatatawigupaz.pdfIn PDF document text
    • http://myqself.com/upload/files/jabakamurazutafa.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210721211418174.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/77366327461.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/bemazadiduse.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/37943990565.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/5743771580.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/57258859893.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/xomapabonolapadumabiwoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=guillain+barre+pediatria+pdf+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_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 10944 bytes
SHA-256: 32c14d1fa45977c62b42d48151fd41e67b040c4a49d19ddc4af5ac4367e868cd
font_01_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 18404 bytes
SHA-256: c92f5546e3e34d335bd527b3ec7f92929da0d1851665bbe95e54b4744b6bd80a

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