Malicious PDF — malware analysis report

Static analysis result for SHA-256 370748194f64b8e2…

MALICIOUS

PDF

77.5 KB Created: 2021-09-03 18:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af96cc3e47b792d4ebaa7d0db1830a7a SHA-1: f5d3dddd5ece57ac6375b0b5bf7d8073c918fac8 SHA-256: 370748194f64b8e2608a3464987d4c27ce10fbe58f17f5c5d1607b54b6636390
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO manipulation. The presence of external URI heuristics and link farm rules confirms the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=simplifying+algebraic+expressions+combining+like+terms+worksheets PDF link annotation
    • http://oklogistic.lv/upload/file/lomaj.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607372e40b3e9---33983963469.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/45665302896.pdfIn PDF document text
    • https://baptistfriends.org/media/nodanilaretipaza.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/davalinizijo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/91e3eac9370419e22ba4a3c26f46151e/rejojibuba.pdfIn PDF document text
    • http://ore-processing.ru/d/files/43791256546.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/88869513585.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/zubaraxokigawufewefage.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/bitiza.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e662a0b9d26---72488078846.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/23926781289.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/befilivedubuzikuximo.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/29031939183.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16082bd729eb87---wademobegaloxoruxobuv.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/62264117108.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/62203528324.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/jinimukutalis.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160835547b351a---gilupapixom.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/kimeremorovilajivulu.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/78433464637.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/17456763593.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/lenimojidajilatimaf.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
    • 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_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 11536 bytes
SHA-256: 1e900a0380490a97cf1a2aea2f2bebecfb44b8453d32a18235d4b7016a289481
font_01_sfnt_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 16872 bytes
SHA-256: 08acd278d339d4315b2d53618dc470894de8c1869d7b4c0e0b0f28846928b6fa
font_02_sfnt_off00010fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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