Malicious PDF — malware analysis report

Static analysis result for SHA-256 1679c7ecd0ded8ee…

MALICIOUS

PDF

88.2 KB Created: 2021-08-25 12:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cfa03bf90a53bbfd21d317ab77db9bca SHA-1: 36fea0cdb0cac1fcbb4d8608315c501034076305 SHA-256: 1679c7ecd0ded8eeba4e8f84f7722c9a1f7d4d1594a1807637cafc5214b7bb60
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092746fdf97e---sepazagiwelenozu.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be800db2736---xixamikonaz.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/kot9g08a3er42ui8klo5b90htg/4296865171.pdfIn PDF document text
    • http://blueyee.com/upload/file/221257416640.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/ruxigagoxutinazisakusiru.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb42b4cbd---savepenew.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/13000316218.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b9b03de25cb8e41df96fa49f812eb02d/46189677939.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/60242857802.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/4971662338.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/dedogemoseg.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092746fdf97e---sepazagiwelenozu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7b0d7771---70989204163.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160afa26b0b4e9---xaratojixezinuz.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/logodulotiko.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1626860743.pdfIn PDF document text
    • http://oodow.cn/upload/file/2107191643579002532zgj4xsjjuwg.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/nuxopuwonujabufoxugumoj.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/29900363302.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/47776615217.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gfo67m9cao9pscj355lak84o11/89187992416.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/52712169370.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/60130520843.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/23165958890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=finding+your+way+in+a+wild+new+world+pdfPDF link annotation
    • 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_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 16904 bytes
SHA-256: d66b1fc8dc439dadc1b943221b552308387fe91014b76eade4a5f151d3d351b7
font_01_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 10684 bytes
SHA-256: 99a43e89b11777adb30c43dad52d3c1aad0422e5a0b9c0db3ff0b5917128b83a
font_02_sfnt_off00013b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1