Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1250cfe45c8da8…

MALICIOUS

PDF

87.5 KB Created: 2021-09-16 01:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2910c03a39dfad43b8158ab46609839 SHA-1: 0feb17b705b3212831d0cdb7965a013c3b4ea851 SHA-256: 1d1250cfe45c8da8b11331a1bb7efc760dce1b66b277bf25d2fa68ea3be508bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to 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://catamma.ru/uplcv?utm_term=vikings+war+of+clans+gold+generator PDF link annotation
    • http://bestofbeer.ru/ckfinder/userfiles/files/zezijuzeziraxas.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/gavowowuxawidodubovatad.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6b9rds06hkoka943avdd8tfgbi/bumikep.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/nibuvesemulujuzekosulu.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/28644103319.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/vexexobivaxebifuxugovemo.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/wogojatonaduzavuxeg.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/31533668591.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d47dea8a7---kimitor.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/35025127.pdfIn PDF document text
    • http://rsentco.com/upload/file/ledujozabijijugunuw.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/84269392257.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/bidapom.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/86928537043.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/53196796138.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/77832542136.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/62128869640.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/lolin.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/39299355001.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/56340913538.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puwif.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/gosirotorodaxobukiz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161408182aa54a---74362452305.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_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 10800 bytes
SHA-256: 03a227ece86218b746b5ef9edf93dae1c634167815ada3064f3cdfd9b383b2c1
font_01_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 17140 bytes
SHA-256: 663587588651c524a39f4222c9abe2b28a4810ed7ca15783026ae2b8f6e055ba
font_02_sfnt_off00013832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1