Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c75b1deaecc7c9…

MALICIOUS

PDF

69.2 KB Created: 2021-09-13 13:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1a3458bb004f369199536baebd15d24 SHA-1: 8208e993575e09d2b394d75f74146d5ea52d8d70 SHA-256: b0c75b1deaecc7c993a907f079aa75702e78f705bc3afb0e0544855be5cfef15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f07f16b6a7---14417242729.pdf In PDF document text
    • http://domuran.pl/files/file/72621189382.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/refuvojizamugodidezutarif.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/74341885261.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/ximida.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/82256977500.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/79546068631.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/jiledonakusix.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/fodifaziwevaxidoperosus.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/suposutidi.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/sulolawanel.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/061c3f16e89cf95dfe93620e28c7bb70/4451709602.pdfIn PDF document text
    • https://kiptep.ru/file/76492259608.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/zisexasepex.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/potiriwazipizomafivizu.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/rasunupizeluvudiko.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/98102137601.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/64864821520.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/gereguzirejetu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d162e3b5d6---30342106065.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/15694077150.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210907153440_2045638279.pdfIn PDF document text
    • https://wita.lt/images/files/14463464874.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/27350540026.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/vavoj.pdfIn PDF document text
    • https://davaocarrental.com/images/file/sojazawalog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jane%27s+story+design+adventure+mod+apkPDF 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_off0000b102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB102 14516 bytes
SHA-256: 8050f8a568d834fda4bdd52dc3210c5cd116eaf07850f74f605002da7fe4d1d4
font_01_sfnt_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 11088 bytes
SHA-256: 63dfca3106e2be55abf9f8e19f1cd0862426650ea796d96a4c884d924cd7d103

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