Malicious PDF — malware analysis report

Static analysis result for SHA-256 0737668a10085198…

MALICIOUS

PDF

84.0 KB Created: 2021-08-01 11:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95220e278851b852330946dd5ae24706 SHA-1: 2e231b0d9cf2beb43b9b061be15ec4a5c94708ba SHA-256: 0737668a100851985275a27260a30f3d40fffde7bc4cb238aaa9bd690e0c7ae3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The embedded JavaScript stream further supports the malicious nature of the document, likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=sears+water+heater+serial+number+lookup PDF link annotation
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7454ef301---31134728939.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/wexoseratomo.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd6872db3---kikafowekiwoxebe.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160855eea63c01---15104279926.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107261105207698.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc59c94f09---vitiluwolifi.pdfIn PDF document text
    • http://parfumkin.ru/files/files/563822381.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/31242426655.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/texapezo.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/lekefodudetojufeposugidup.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/zexefebitimilo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a497fa1e---62775202632.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/v3q7o0uk20ahjerk07904emro6/jidakunam.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/winagutibamutowa.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/16531407003.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/xozagekemuj.pdfIn PDF document text
    • https://flyags.com/editorResources/file///vurisuzadatepebutorebo.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/27057931784.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/011a3ba69af47392b0f7800e3f198db3/37113388208.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/latuzizeloxera.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/jifuzulakusolipoxeteputij.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/37338640896.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a591dd83141---79715121897.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/73156032990.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094491a6fbbf---najozolokikif.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/77206116335.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_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 16664 bytes
SHA-256: 25a16b07f7d1c3a2cd6e345ab430218d24bbc43003f0df516564b70c934a11c7
font_01_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F5 11008 bytes
SHA-256: ead1901add4a8a203619ddb1cf031be39ec3ba909e3a503104f490f6c9e27304

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