Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a39b0573be1f1fd…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 15:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98ad9ef7379ccf836bed0559bd48032b SHA-1: 27c67ce10af1ecf87e4f33392b9b6a692fceb33c SHA-256: 9a39b0573be1f1fd451d9b07533a616973786ef30b22a342475b6f21d01c0be0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The embedded URLs and the PDF structure suggest an attempt to deceive users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=norma+sspc+pa2+pdf PDF link annotation
    • https://myreply.mobi/snappshott/editor///file/24635683497.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/xidarukubolaziloxotonumo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jm09j5ucrudb5m0ehdtibbr3d1/89870806126.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb7ac82c51---94413987863.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/zebedomaxe.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a4fb820f---55768531841.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2fe9e4239---61954460187.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/42117786839.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c315539bcbe---78722816060.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/zegekezexijoribezo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/37137638962.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/lifijososolafeta.pdfIn PDF document text
    • http://veivel.com/userfiles/file/56052897070.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/gefevizoneginebumek.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/kutidiwafesipu.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/lukideneromiko.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160868641285b8---68596467947.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/9ff7228af259f51c5fa4d87970c157cf/xakezajugupudow.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed39a1e8c4---12582888143.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021082613354999.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/48145338642.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/dixinubulabugakobamoweji.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607735099f674---66459039570.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/soxugofanazubasini.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_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 18320 bytes
SHA-256: 4d42ac2bddfe56a3b31483f452e0c25cebe861b4e52fa2abcdc5b156faf0c936
font_01_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 10404 bytes
SHA-256: 1250e9d8dba132a3ce29a415e2130a334ea9e376c0a7756d46d2163986bdaf09
font_02_sfnt_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1