Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c36aa69e002bc4a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-12 18:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c5b53c5f600ec2c9ca2ff9200069baf SHA-1: a0c72f92af046100d467756c257432bb26d8739c SHA-256: 1c36aa69e002bc4af696c0cdaf01ea666c9e156c0295f056162c1d79d3a14d08
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301a4b15ea0---nuzifofefajunixo.pdf In PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/41121140773.pdfIn PDF document text
    • http://pasted-radio.de/web/files/22708122331.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613065e20e124---rimejejopuzunelabiv.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/49400769467.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/legodilawarunutofijeze.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/bapunusinogorej.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/ligomikazuzivo.pdfIn PDF document text
    • https://akconta.com/uploads/files/genuluxarexemebewuzavagak.pdfIn PDF document text
    • http://atrsara.ir/resource/files/46910784418.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/josetadorofuwipesunisuxim.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/suranesakofugikaxikalo.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/fewixidoxogikivifepexu.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/ravoforavelizuvaxuwowubak.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/puximinamipamanarigatuw.pdfIn PDF document text
    • https://andhimazhai.com/images/files/33945206203.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/92013226033.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/sodubevisukug.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/rebepufunaxuruxixijusano.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ec6ad65f16a54eca7b9ce49d2ab48f36/30660234493.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/kagazatexu.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/menanagibezipevevubibibid.pdfIn PDF document text
    • https://clubon.top/uploads/files/44456851894.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/xaludiniwoxu.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/22449482288.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/gufobezitajex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sign+up+for+droid+vpn+accountPDF 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_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 10692 bytes
SHA-256: 36f939c547ccb23916c80714d3f61f108bbd98afb7d9208732c2cc98c09324bf
font_01_sfnt_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 19068 bytes
SHA-256: e17e0fb391bd7bc530b16b0c60f36a4f6784bb089ef3b74e39400c8240136a4e

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