Malicious PDF — malware analysis report

Static analysis result for SHA-256 70dad05ceffbee21…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 19:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7c55dc2080b7b4a47f3a8052b9a29cc SHA-1: dbd74de1b4ce3f1f19f641f2002346b7dd95edaf SHA-256: 70dad05ceffbee21e60f403cde8f147409fb9be9e84b0be83c994386624f60ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://guruvinodji.com/Userfiles/file/bukupege.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c058731a46---wefarobiwuvuzodatix.pdfIn PDF document text
    • https://dukupahit.com/contents/files/82922240776.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/posuvalojomo.pdfIn PDF document text
    • http://tavio.su/files/file/xunalowemesogexegoliji.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/wogipolosa.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/wikugevob.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/porularikusirokax.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ublbg2pitp2obseqd5a66uuelc/kaloromawagemirekaba.pdfIn PDF document text
    • http://blgjad.com/upload/files/16714493539.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/nizivorifusesoxefuzin.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/28686028140.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fuvuginasata.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/tosezakurux.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/38380778159.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d1d3231a0---62536059475.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/kidefavidelomikibebivil.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/59801807432.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/92857062236.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/12837097834.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/xikujonexowuvorunega.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a38850e235---risonisoko.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/4557555122.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/ginawevidiwanokexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+turn+off+location+trackingPDF 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_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 10524 bytes
SHA-256: 9bbe2cdec00d204eeb801d5489eb8872d0627a2da514d4ee1aacf8b61ab5966d
font_01_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 17084 bytes
SHA-256: 686ddd0734e075b500aa91637d6f78a1aa06ccb42babc492dad980bfd10e9960
font_02_sfnt_off00011902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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