Malicious PDF — malware analysis report

Static analysis result for SHA-256 455e077533612ef9…

MALICIOUS

PDF

99.6 KB Created: 2021-09-01 02:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2e835e2cba8408035c0794dd29d3f07b SHA-1: cda943569c4840e3b54bc5f57745435ab1de943c SHA-256: 455e077533612ef9ed4e953a22718ed4866d1e33290faffbde395ad409545432
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on domains identified as disposable or potentially compromised CMS uploads. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The structure suggests a link farm designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://fly.no1-yes.com/userfiles/file/80222431120.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/de35cd75ad8d045cacd23fcc096ee782/27451210550.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/komaxovijaxeboduxeb.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160877e7a2b652---bifazudebasanibigumap.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3272cd7a33774ab69453aec73e4ce3ad/49631030636.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/sofemalig.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/fewurimawozezofigeba.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d0b7cf16c4ef05a3ce791d767013e520/rakafifotidupad.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/rosotutumufekirinaf.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/93515152787.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611e63d4b194d---27895969953.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/mozusarimijabefam.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0b30b68b6---8048825229.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b7de9829---94856898612.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/dexojatigemizadu.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/42910315084.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f325d4ec8---wobuje.pdfIn PDF document text
    • https://aneri12.eu/res/file/dofigidanogimogobipojuk.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/99314337147.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2a4fdae43f85f01d989bf6f4a5887229/53789585853.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a7f27f97b7e060a48335fd005a5082ad/32781130838.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/kexofegexidanajebobete.pdfIn PDF document text
    • https://faceless.me/userfiles/files/47472310504.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/93783950881.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5364d0659---438419608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=big+words+that+start+with+mPDF 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_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 19116 bytes
SHA-256: 613b29a50cf75043d5fd7e4ce810eec49cec7f8ce2c78b3e8839210dc53f8347
font_01_sfnt_off00014fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167FA 10552 bytes
SHA-256: ee9b5f206ae3e2b39c7d3ac4a1942ce4099ec247acace6f238c49ec07edc526a

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