Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef74ccc4ca892367…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 03:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c8fc5ae652756bdbe6c79faa87bcc6b SHA-1: 7dd698d51b2cb5c911f2dc7c10645b0efb742321 SHA-256: ef74ccc4ca8923673fa23f9c02d80e08b19875fb12a9d0aed49e62b8ad02d969
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. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://baoholaodong24.com/userfiles/file/52337726418.pdf In PDF document text
    • https://quangcaowebsite.vn/uploads/files/74255547987.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/bipuwerumegoroxukojofepu.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/gonarakotinuworapanos.pdfIn PDF document text
    • http://cib.lin1.ca/phpsites/vertical_living/uploads/file/zuvisemagezave.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/52560654786.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/33893762896.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/37737401238.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/boluzoxokirebetibe.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/98017976418.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210910221246.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09998f907---kaduvokuzavo.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/javidolukakajujavonibuw.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130521fad3fd---guradiderefuvipiriravaz.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/xajopudujovow.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/niban.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/fudapukos.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lcutd8igfe06gs1tg8mc5o8o41/kiguwumamerexap.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/rirosajedorinapawavenora.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/xurovosodafuneboku.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/poparopoxumotunugun.pdfIn PDF document text
    • https://taperagi.com/contents/files/72538085732.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/10513299216.pdfIn PDF document text
    • http://edituj.cz/res/file/tuxawakilekadasaros.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210915094431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ayyappanum+koshiyum+watch+online+with+english+subtitlesPDF 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_off0000b4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F1 14708 bytes
SHA-256: 2dd587b1ce786a9a61741c00c91b8ad34abfe25e38d3d4a65e4a97868748c6b4
font_01_sfnt_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 11232 bytes
SHA-256: 1a8d5bd98e1a9a7434eba237452a1b89f16193c59520eb2ea47f63ebd455e587
font_02_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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