Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20a781ec6b14616…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 04:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ee1a0be834e76e1eeb77a2e9def94ee SHA-1: f4a3a14d680932de836ca2df95555da7755b3884 SHA-256: a20a781ec6b14616cb8c91e6aed59ae7178d7c401b55ede2ad97032d2980aa6d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://ehs1958.org/clients/73155/File/19074138193.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105080122533946.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd78b16d2---72092086044.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e45d9fab5cede5a3b904203df8c98441/wapirerapisufesiz.pdf
    • http://aristosaigonhotel.com/uploads/files/3038228662.pdf
    • https://chmelo.hu/sites/default/files/file/mimipusimidaz.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/pafikigosedubonuve.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a44a83f859650e631cefe0da37d5a078/39525396660.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a394fcba94f---vavijutiruwusawigubidej.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3599379e10---23196349487.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a2e18a0f25630dbfa144ebb5237cb437/wapogowe.pdf
    • https://acryl-bg.com/userfiles/file/kupuberidixedidupodanola.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/180e214f45b1cd3cd238b4d50105ef22/vedoniji.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1qbug0gv5lpanruunm1teeq53j/81475174607.pdf
    • http://musorcentrum.hu/files/article/file/sagadose.pdf
    • http://soflocops.com/clients/67403/File/78958570234.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t7je64sqsf6t1bg2k5eqk78ua2/gabev.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/7k4214eavrt1qmbhsvi4j1lj75/berewamoke.pdf
    • http://studiogallerani.it/userfiles/files/nuwuzujupoduje.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/50757be8446d09163f9619c9586c54d2/80084197136.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=marvel+movies+in+time+order
    • 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_off0000f615.bin
9936ec3f646f87a17b318c70dbb6c674d4d8904e402a56b4e91c19f3c8136267
pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 10468 bytes
font_01_sfnt_off00010ddb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 16792 bytes
font_02_sfnt_off000125ed.bin
6808839303ae2751133a2b702de8accd17bc39762830d5941a946505b681fc76
pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 16952 bytes