Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea2a7588892e107…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 11:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 99e853ca2185d837e6b0526e02b28d4e SHA-1: e41eb3354637c313fbfe24d3f0defac9d29c8fbc SHA-256: 8ea2a7588892e107916354c227acb50465ba88fbfcddb13b0efb290ffb589d42
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e94995ba37d5afd7d7e10c29b98d1d5c/berikezovowegilogafak.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad864aa8cde---vepewafotasikuj.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/jatonujilo.pdfIn PDF document text
    • http://gistys.com/userfiles/file/lodixefob.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3f68fa43---lisub.pdfIn PDF document text
    • http://lj-group.cn/upload/files/moluzogutuwurinime.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3094b588e---madesisedadetobofobi.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/18b3b6346debe2041d54b65f4549cc77/liperon.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/84164476944.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kjc307stjncaiq57q96s0t4u5v/25205315721.pdfIn PDF document text
    • http://www.520amis.com/upload/files/57391295369.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t59b0mlackpe8g46f4sk9gm7t0/zegapudomejejalo.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/65295386772.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/o7pn1haopa6a9chnfo0k4dflj4/19169938254.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vowejikagakebawufopejuxas.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/7834564226.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b3fb1d2b979e46c821f0e13b52081e96/74050699349.pdfIn PDF document text
    • http://atek-ent.com/upload/file/98279671150.pdfIn PDF document text
    • http://chennothinterios.com/uploads/file/jivarizeto.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff05fe3d162---61586784341.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73765437f1---suwulopajamiz.pdfIn PDF document text
    • http://aimic.com/userfiles/file/66245021334.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/75383211189.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/gidapewofimavofogel.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/silusoketupasejutevogataz.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/aa52ade70b41be467c9653309485ffb4/92564111407.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3ff6ec25c94ba41ecccbd6d3a5fd5972/55449185647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+repair+a+corrupted+pdf+filePDF 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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 10688 bytes
SHA-256: 2a41a78774b6285c83fef14ef027a9ebbbf4e7e636fd9416b45e69396b80324c
font_01_sfnt_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 16500 bytes
SHA-256: 40bb8754e2f191152cabeb74f8a71cdc6a97db9268e412b15df250fbd51a0bcb

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