Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1886ecaa8787d9…

MALICIOUS

PDF

83.5 KB Created: 2021-08-26 14:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4e4347ca909c67a1e96935f5dd9998a SHA-1: 1ea6bb7aff6570780eb76f0a6f554f7eff09e0d1 SHA-256: 7e1886ecaa8787d9f5e78767099af573ff57ae5b29b9e80cce30a0395cd044c5
156 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 numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics strongly suggest this file is used as part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=any+signs+before+water+breaks PDF link annotation
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/75f9871f0cb1aebf60c385a3bcf19df2/38838314311.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/vamofa.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610973bc6a4df---tileratodem.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/gifipavazul.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/wifasuluwogur.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/fimiwotino.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/t9vgf43oli00pcebulaebuc2p3/25753518049.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609012831b00e---demaxanepesivuje.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/17849939865.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/38570655288.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/49798694983.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/wenuluwigekamot.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16080468b13695---vibefirejojuwurijaga.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9fkgappn9pgmjae03f7i54l1r6/78028601759.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/dmotql2h2fa4lo74r1auq2o2qt/5318978355.pdfIn PDF document text
    • http://emeat.ru/var/files/76813850501.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eb4d8cace---bapuv.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1d67e2944---jawupemojadafa.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/pibujadagipaboletedojo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b520a6433---wifitinulidoza.pdfIn PDF document text
    • http://szpk.hu/_user/file/88292816716.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/37585948783.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2b2fa10a2---81174885889.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/a8no4rim3mpeai5o1a960tiil7/19142807121.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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 10756 bytes
SHA-256: 7a2cbca4b41ca41da5ff71a73f71b5462ae623d28972ebb7c5b5f4fce91455ba
font_01_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 16768 bytes
SHA-256: c7a335bd7d86d5ba07be18f83b7a1d86dd46efb2b134c1c773d72dd9c3b6828f

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