Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1672cd2273ee97…

MALICIOUS

PDF

86.3 KB Created: 2021-08-03 02:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2982fdf1c8ec835387e840c8cb01f65a SHA-1: 07bea21aaca60eceb22be467a82da17273f88801 SHA-256: db1672cd2273ee97ab5d4525ec7c46e7486abe2dfd7a77a91e636dc5f930e6bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lead users to phishing pages or download further malicious content.

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 https://coretry.ru/uplcv?utm_term=imagenes+de+las+partes+del+cerebro+humano+para+colorear PDF link annotation
    • https://masihpt1.com/contents//files/733557586.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/jifivog.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070a45a947a1---remipomexapabixezus.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/54462606995.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7f07efd1f---roxulovisodu.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/35356116095.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/60kcjc7arqc72j056e5liashh0/wazegebik.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/ruwasamevaxa.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c81e5548050abe3057667dd91cf04607/20661086664.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b861f2e7d---fikakumedilolegonipasoxif.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cdbadaf92b04e1f1fa6cd9fe9c305a1d/84387838763.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1d2c90c87---22425803110.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e730fbe3060---57981211877.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/dotawegesisevotonij.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e5c96b38---dokulenulopizewagorolivog.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa23c6090---mufadisizevamibukemomerux.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/negujobegazevafuligiwojib.pdfIn PDF document text
    • http://abpaluso.com/upload/file/47098296503.pdfIn PDF document text
    • http://elskenecologie.nl/files/nixapananusopitubuse.pdfIn PDF document text
    • http://erex.hu/upload/file/xekukemifob.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51c2996bd3---siworoziwel.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ca465647---gudunozipodixururezagojit.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ic3eeb7a6gd47pm6ejob3a5tm2/22076271498.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/69743824938.pdfIn PDF document text
    • 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
    • https://medlineplus.gov/spanish/brainmalformations.htmlIn 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_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 11060 bytes
SHA-256: 4e2fb1f7724418fdc88b626b1b86bf5ddb7bc067aea5f1e8276e1e1135e139e7
font_01_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 18624 bytes
SHA-256: 720df7ac90ff7c0bbb38455b0980441e713b9399250e2b95cc6e4eab9c0e307e

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