Malicious PDF — malware analysis report

Static analysis result for SHA-256 9378148bae8130e4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 05:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20124d4bcbe880ee65db65bf5560b6ac SHA-1: 4e1dc42ea0f09295524bf44535f74f4182c6fb75 SHA-256: 9378148bae8130e4488e4aa509fb85b5a766529dcaf1982dbd9820a7be7fc54b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories or disposable hosting. These links are likely intended to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/24utkc1unbdcu33502n0j0bjk0/27203624391.pdf In PDF document text
    • https://skiclubraonbaccarat.fr/pdf/derokexazoxevusuxuvobigib.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/tafudeka.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/jetiziperametu.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/pupkvl4i6bn5pddtm1s8ih9kq6/lezajanisew.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/jubizenazufapirig.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16124a03479d5a---noxijaxusokumolunoko.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c066063f01b---fovaguzebi.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/6344618263.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/2424884410.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/dipejidoxozotedir.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/99745346363.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210705022515.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/9325495236.pdfIn PDF document text
    • https://digireg.cn/upload/59266732853.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/molefizalobidujixudomez.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/34984204814.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/rosidudonud.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef50f0709f---52585733458.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/61864738690.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/lisow.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/fijiselafajelakagom.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/70743411813.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/pejudumoxowivit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=shuffle+hands+card+in+unoPDF 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_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 10652 bytes
SHA-256: 14981bde890d33ac40dad3e7c56be7cab823d877c39794efeb8d1bc53127af01
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 17984 bytes
SHA-256: 5e8fc8b7673d093157cc93d076767488d71a0f677967ccacb62458d1ce030128
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1