Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6cc11545be04b0…

MALICIOUS

PDF

81.7 KB Created: 2021-07-01 12:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3562a90b3bdc3c8e8c6786f8175ae24a SHA-1: 31ca86f6a808a500f8ce82ac9d7dd930235feb54 SHA-256: 6a6cc11545be04b00810c1216d2cca768a55209356fcba752e313d61dd386a01
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers 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 or disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=toy+instruction+manual PDF link annotation
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/5970564121.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e97ad98e41bc393be7a7a718fbb96685/difapekanesuzumemotazi.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c65e27dda80563171ca43322fa881e15/nemefu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae2e8c424---sigepiguta.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/ranifebulegotamudabovap.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/l7hrnnqr2jol7jm5jmiot4k7kh/winesagulanamekatu.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/gijadipoto.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1623960675.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/2830832662.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/dituforelapupupobekaxido.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a150fe52016---wutelonemumerujusojofima.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/e8la319ke6d4qfucu2nvu4vbs4/muxatadu.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/42929562431.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/22578087800.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d5dcc19cce29c28156878a23fab01223/41429922825.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/lonijenadakipebinuse.pdfIn PDF document text
    • http://coffeetuanvang.com/Images_upload/files/virajibinejefenezepa.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/42091612249.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3disjrgkh8jgq0siifbht6ic1t/mulipunoxuzugapimuk.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/mokixewek.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/6948515dbdb3ced0ab18014f8cf7315e/wesegipilevugen.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_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 17352 bytes
SHA-256: a0a24dfb92edbd1c026530f84989032b48aeb4c35a9d0cdab73aa953c8775e22
font_01_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 10436 bytes
SHA-256: a34c1c1e43e9a6e9d7a9a44bd4268bc7b4a2e55f6a28a9aa902572444252e78f

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