Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a731e4b377b0a4…

MALICIOUS

PDF

81.0 KB Created: 2021-08-19 00:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 0efd43eac639a9b3083750c2719de32b SHA-1: 37b00fcfaae8b5abe88f265bf6cc81619bface1f SHA-256: b8a731e4b377b0a43c99e1bf54e065b3f80673bc58fc6d5272e7255e4fc6de31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://infrive.ru/uplcv?utm_term=11+s%C4%B1n%C4%B1f+esen+yay%C4%B1nlar%C4%B1+fizik+pdf+%C3%A7%C3%B6z%C3%BCmleri PDF link annotation
    • http://jiangsutravel.kr/userfiles/files/20210805_175204.pdfIn PDF document text
    • https://aashianarealty.com/file/dovizenufarowaru.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/jetajadaji.pdfIn PDF document text
    • https://promise-land.com/upload/file/guwavumavofesosovegagu.pdfIn PDF document text
    • http://technocom.pl/editor/file/93269234943.pdfIn PDF document text
    • https://eternalbliss.net/file/zefabofenolezilizajunebu.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/78576858411.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c13b3a2ce---tirarojotunujaxesareda.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/47971385960.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/85777616334.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jazomekakawu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f56e7e45---80811891631.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60fb46acd---nulog.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1c93773f5ee46fad14d45ade67c460a4/podiravetufipufidefe.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f63dc11679343a790bef9a9d0806a44b/nofej.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vblsifln6cpj77q3dnvea2vlm5/lerividezawu.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/71359402643.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/lakawubogegorijedomuxevi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f578929bad---27248005516.pdfIn PDF document text
    • http://bensonhigh67.com/clients/55910/File/23864411495.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076230937122---83117641953.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/xawuzidefiwomo.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_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 18312 bytes
SHA-256: b438f6b650bc53526c767c466c57e36bbcfb8f1f2006e9ccbcca3f6c217b9faa
font_01_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 11312 bytes
SHA-256: 1931877186e2fc1007d1f3d093a10ba1fe1383cc0cb6f74b62047adee1075392
font_02_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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