Malicious PDF — malware analysis report

Static analysis result for SHA-256 658b69a56187298c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-08 19:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 889693694d703b9ed6f4ec87ede0c8c1 SHA-1: dfec582d1a434ad42a4bfad10b84bb39d738dacc SHA-256: 658b69a56187298c8f0cfcce477cfc6a486fa292c53069c8906da33acdeea824
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Numerous heuristics indicate it functions as a link farm, directing users to various external websites, some hosted on compromised WordPress installations or disposable domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to these external sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=addition+worksheets+pdf+grade+3 PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf0dc549b---jikemitazune.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/dagiriwozomenuvifupuw.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/ferimaroxivavemativas.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec24b0eee2---sovujekerutuvafusate.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/71548086092.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/siwasulowaji.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612effdc99f7f---xosojubuwuse.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/jasumira.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4772e79a---19934377666.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/lobamokuxuvekamafiser.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5ed568d20b115938cdf2d4e02924d412/31842924508.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/sedenarukatexagokesewotu.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/laweduraluxunakarino.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/56569367600.pdfPDF link annotation
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • https://careersourcechipola.com/files/public/binupa.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/wuwukidurex.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a3517875---vikumexofezemere.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376639699eb---rofopuwesitise.pdfIn PDF document text
    • https://kenadong.com/contents/files/jevafij.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/repejogosavotevelalatafu.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/42877259127.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/39871842584.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/39297739392.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_off0000b9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B7 11060 bytes
SHA-256: 203519d6587c65e8efdd6b45d983e56621f5cf65e80d2269692a3eb19d4a1db2
font_01_sfnt_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 15872 bytes
SHA-256: 2d85bde06c8dd65af3dea5a04f2d600cdefc7c9036b4e3b1ec1dd63d2f8d7068

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