Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e44aafe136b3fac…

MALICIOUS

PDF

97.3 KB Created: 2021-07-10 00:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 338073f835cc4afd6124ca2ba1f4c435 SHA-1: c4a244b692b80e88ca5f7de75fa6589aa9230198 SHA-256: 1e44aafe136b3facdaeb3e6ac4b637a8c082459b95349edb57188d2b239aaa23
96 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and track user engagement, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 5

  • 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://medvor.ru/uplcv?utm_term=and+i+was+wrong+and+far+away
    • http://abwpetersburg.com/uploads/files/pexenofekes.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b62864f0---pinumojodipudosenotisapaw.pdf
    • http://ambvetsanprospero.eu/userfiles/files/kadum.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add88e9911c---biwenesagulu.pdf
    • http://misspacificus.com/clients/873634/File/78291086999.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec49d53de2---getuvegajesog.pdf
    • http://artside.org/data/temp/file/14906416587.pdf
    • http://syuncyoku.jp/upload/file/guwenuvudoxabapelabubun.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6ec79706649df2adb5813e33c232d1e9/40651659216.pdf
    • http://agendatourvietnam.com/hinhanh/file/fotinazuduvazesomulo.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db5fabc6ecf---63689452283.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/61018b051307919f93e2957015df2d69/dolitewofurikonibeg.pdf
    • http://flyingcarpetclementines.com/userfiles/files/dokosopovadifumex.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38c61ec65---89044506518.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5873df115---petak.pdf
    • https://condicionamentofisico.com/arquivos/file/rivanuzexuxad.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/ml0e6ti0ctcr3lk1d1553vren1/zagepelolajuretewab.pdf
    • https://kopari.hu/files/file/kolowewufolabipiguvulu.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/peasfe08r1ep71n32asims9et1/92369568862.pdf
    • https://nikosdimos.gr/userfiles/file/65975384587.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85392e474d---dowuzav.pdf
    • https://quaint-house.com/images/blog//file/tekafewotutuki.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a0f291380---93933501995.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/651fe71d02c4d26903699425409069ca/lowepuz.pdf
    • http://119hero.kr/userData/board/file/74657170376.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb37bb601f---24042842813.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118c5.bin
b4c0a6f6de630c36949e35d528b25094bdf67f00f47f6df24b44cbf3c24cce29
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 10436 bytes
font_01_sfnt_off0001305e.bin
b3f3a37b9b0324b5af22b5c4d5fd0b7c1288d45cd0f04d91b75449026ac51c6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 17920 bytes
font_02_sfnt_off00015fad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAD 16792 bytes