Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4311b6262494715…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 21:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7c9888a28238f1dd2756c9995f91aa19 SHA-1: edaf36b099f56ddc0c8a2073e679d7531355341d SHA-256: d4311b6262494715e10988e18ef52d61db1fe25df504e14ba4b0bef63b1f6a40
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff2e6693fe---11686646239.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/86480d68cfb2952e35d9c383149dd9ac/mopawuma.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/54eae646aa432409ccc7ee52080ddb69/tiruzitu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1b356731823ca59cffe7cae18140a783/butavutodefurufezi.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/telixidubu.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/kekisixarazefomedodagowa.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/nipuwizivorunu.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/lamubulivakuzugekivud.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780138690de---tadanorogoporisoba.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/d70bac1f10d9ede5d751a78b9b2020e5/64736039301.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-1/20210701234935379720.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/mavejixozuja.pdfIn PDF document text
    • http://greenbrier101.com/userimages/fotededabitopojimidewulib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810bb568fe9---galularimi.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/kevebukem.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/kifinovamorido.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/1320092887.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/75229005008.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/69758e18b86577191ddb093359e57bd6/56621514890.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/simovuriwigopomez.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7b1984b5fd4c1c51b8719e755765628a/64418678039.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/dd01f7d1fb64dab592789ef5e8d035a5/lubupelesozupazon.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6fb5df7ef---gesus.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/v5h5h8q7tdmq57of8sag4n1vcn/49814654090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=exclusive+agency+buyer+agencyPDF 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_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 17320 bytes
SHA-256: 922e8cffb90327098e5af941a89022d09faef9fa8a4793f331d48a238f0f620f
font_01_sfnt_off000125c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C4 10692 bytes
SHA-256: d99ea4c37bb66512462c55f5ccdc1aeb7a6ca63e789cfbbced92f740c5eb3ad7
font_02_sfnt_off00013e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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