Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5615b707e064e0…

MALICIOUS

PDF

76.3 KB Created: 2021-09-21 00:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 248022a12ccb61560fa759509075ae67 SHA-1: 429669e3885c83ba02018e2ea552a2332816a8a4 SHA-256: 6d5615b707e064e017d30f598c256a5d473b71789dc518c386386cd387817886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or redirection mechanism. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation attempt.

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://philabc.ru/uplcv?utm_term=dragon+city+unlimited+gems+mod PDF link annotation
    • http://hcbarrett.com/user_area/file/41909272412.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/jorugigan.pdfIn PDF document text
    • https://basisnomor.com/contents/files/44617970098.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/96455666084.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210914_112841.pdfIn PDF document text
    • http://zzquansu.cn/d/files/xeluxiwusafifuwat.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/velubiguwakuluzemuxuvereb.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0d0cb4fbd---xigavuvo.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/bapulokemafofosekunuxawo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/54905222628.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/teroponinobasuzeb.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/97789671643.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fm0hqav6h7vgl8oa67pmpi0s2k/xirepemadaxados.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/lixujaxaxinuzikuvetudoma.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/93932750438.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/42606051525.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/nasujafajikaxe.pdfIn PDF document text
    • https://majubesar.org/contents/files/10052807963.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614259b4e1143---pifixixurilonugezavo.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/62491659016.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ced03c59d---80761653737.pdfIn PDF document text
    • http://195exim.com/datas/files/23374871782.pdfIn PDF document text
    • http://schokofontaenen.de/idata/66568120359.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_off0000c365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC365 17360 bytes
SHA-256: 49aac430f37de3973c33fde7395af7bc1e6798889bdb22a6389b7b7b78498779
font_01_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 10928 bytes
SHA-256: c1eba72e6a6dc0dff7ed8c1ce7a1bff5e35b65d306aad21c7d7784b62fe774ca