Malicious PDF — malware analysis report

Static analysis result for SHA-256 a045882958a282e6…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 14:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7244f66dc3621f98a8656ddfae0e7473 SHA-1: 03e88f12f9a5c2ebf97a35fbe28f6004e1532235 SHA-256: a045882958a282e6b18dbc51f9c5cf28a383e20f58c9ead21f743d93f0dcd8b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The heuristic firings suggest the PDF is a link farm designed to redirect users to potentially malicious content hosted on compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160816fd4cfb89---39947128018.pdf In PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/4fda60b2f4ad35e993f9f62609f4ca41/jemorupina.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0c03bbe1---23533429348.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070c84d40eb4---64128273865.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/xikazavukefinowomava.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc778a9184---jujemulabaruxezafinizaf.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r8af0c22442c2998u9ik4s86k2/nogufuzojuzereke.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/318d2f9f366c4aa42411b2a061cf7e52/ziluxadufegomi.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e3b8e86d9---87056905761.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/95018471256.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/24260144757.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xetadexivujosodukalim.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1bfe1afdb5c2723fa16826e05b81ca5d/lixokomux.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/magapavilomasezifozupesa.pdfIn PDF document text
    • https://schmitz.cz/res/file/850047489.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/714c0996d79bf8530a023eaacc12c7ea/15186660342.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8dfbb77039337f4a0cd999066c3e56d0/ganifigusoba.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/20095142694.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/damimavekowumixasilu.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/feba25607228d1e30b1c73a03d50f367/70788907212.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/bd126dc6e416233edb7a7bcc7d1dbba8/17553419336.pdfIn PDF document text
    • https://argumentua.com/i/file/mutovunodozaxemimawapev.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/80444441185.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/3957364791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=facility+planning+journal+pdfPDF 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_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 18428 bytes
SHA-256: 1b8413bbead046627e73221e7fc2905409624f5223bc7efc4e08ff69e19fadf4
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 10816 bytes
SHA-256: 0edc6100925035d42a1c8cf6ef99d756886aaa23f80449fd33a0369c46e0be54