Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf30b990bdca5f53…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 04:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f3d429652743c73db89c5e0f26139df SHA-1: e254065b05159338a3d5b508d073b7cae8fa2ad5 SHA-256: cf30b990bdca5f53b02af97a1a54750e8ee6de8ad40944aca50eb0eb7c98ab91
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm suggests the document is designed to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161332e8873747---pugofasafopolebaputikofur.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/713f868f88f925b773fc9a69cb5ee8ef/tinodiwodajevofanidota.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/83722999414.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/34842299130.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-17/20210917031433182207.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/jarenudobap.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/faloraregatitifajaxawevuv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd21a2b8d---bijinoveda.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e8332e485cf67ef0a74a88e613ae1c7f/dizefumeb.pdfIn PDF document text
    • http://sakem.org/userfiles/files/2538366698.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/tujowaju.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/lijikusebikalomapedilod.pdfIn PDF document text
    • http://sbairs.com/datas/files/sovusimobepudezaw.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/43191307307.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3usrgne3akkpi0ksmqrdd08le1/juwiwiwizawibubixirat.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/91639897498.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/palalamadawuvovofowupido.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/wilalofewo.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/57247301879.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/33924401030.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/gapexakexeretaxa.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/46305006160.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109010654242830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=3d+cake+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_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 17148 bytes
SHA-256: 2a05d6eca61bb711a9a4551c38f50db6710d88bf8fb023e09c32f0256444aff1
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 10232 bytes
SHA-256: 8e8f51061e9b6ae9376247fbabca221048b88b517087800255db8a1e0fc8a615