Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7fcc15d868adc1…

MALICIOUS

PDF

81.0 KB Created: 2021-08-04 08:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 02c19faabaf131bd087118904c93e43a SHA-1: 5c7da5ce410fbebebe469d97e327ec059469d3b6 SHA-256: fe7fcc15d868adc123f16bd434b88198a779c47cf9d498242e500a671869bfdf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple compromised CMS upload links and a link farm pattern points towards an attempt to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c59a8de52---40383260009.pdf In PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6838a597---6317819867.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/sadavofamogav.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/fegojixogorurexavita.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/diwagob.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/wodujiviz.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/1182743604.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/17491348049.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/81692495969.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/zopopomilozibesat.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ef1894532b1b7e8f21ef35e5b44d6a8d/mezaw.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/talolegufus.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/rheg4eamnpj2crjtdc50sdgku4/12822922579.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1f3d3039b---vaxusedizeborejevajigom.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/55718490367.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/jidixolepixofirurawe.pdfIn PDF document text
    • http://teplospectr.ru/images/files/mawulukonativoper.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/8606471334.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/2009021914.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/lajok.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/6758234020.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/xuraxipimapowox.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/85509271870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=roms+needed+for+pokemmoPDF 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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 17292 bytes
SHA-256: 3fb3175a90d92d199bc05735ea8242f295dc03a621b140121d23891081f901ca
font_02_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 10396 bytes
SHA-256: 8faac37fdfaebb7637493defd1c5085f9fee5a494b6f15954c59439cf4b79fe4