Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a4bb6cb1cf31f9…

MALICIOUS

PDF

84.8 KB Created: 2021-07-25 01:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f5a729c60666d49d23eb66e17b950ee SHA-1: 62c44fef3844d24a8783b581cf9bfff8c1135400 SHA-256: 28a4bb6cb1cf31f96b3ddc6a83797c2a213b96c7fc0634cdf768c7286e56c7e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple distinct hosts and the use of disposable hosting reinforce its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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 https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/gg4roaj5r99abr51hgqa214lc8/85938217860.pdf In PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/604dc0016f9fa67f0213339c4f9f30e5/batosifupepatepibozed.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/59c1e7e4d39761b1b292505e7b8c7c2e/65573490316.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5deba7c4fb---72335823965.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/pivuzodofuwodirariwe.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/25099209290.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d61f8bf4d---bolozisowivinijunoso.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce26c90d3f---kugumegalusurariwuvazik.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/perivakamikifosison.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e52434b2235---xomul.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/1a17k79cpi6efk26f2a92ga395/75536316098.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/raulkoslj2piq72hcoh8votivj/70017749130.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133e6cbb6e---zififesi.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/07fc33ba5fb38b58b310b81cb87d702a/mopuru.pdfIn PDF document text
    • http://gapp.fr/medias/files/juvulokirid.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d498206f8---kosozugijilipukeduromu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c23bf412---76911373225.pdfIn PDF document text
    • http://bfo-walkforhope.com/clients/e/eb/ebd0efab9cd97e953e90891d9eec7aad/File/62788916463.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/15202258850.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfb382d2f5---monevisajipijerejazogag.pdfIn PDF document text
    • https://wineart.online/userfiles/file/73873319732.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7e3cc75640095e260d01173966b6ea31/wixizigaduraxemekegikoka.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9b50a1964fd5ea4087dd85d5e0cf02ec/32285504213.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210619212414.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/86837015277.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/telidowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=english+grammar+exercises+for+class+8+with+answersPDF 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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 11164 bytes
SHA-256: 99c9a19b9110543c27b12cba6cc3d06072bf4bccf3bf6cbba8ec40a12deb316c
font_01_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 16888 bytes
SHA-256: ea09d028068175afc31c994c2815570896e4f2e96e1b1bdb0a551bae24263db7
font_02_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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