Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf38f67711dd802…

MALICIOUS

PDF

122.5 KB Created: 2021-07-30 00:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a447349e75a5b1756ce1bb576e2c72e4 SHA-1: 9397b5b43263bd7d34f104ee8161ca1de3131f17 SHA-256: 1bf38f67711dd802a9b370fd9f3e9d417e32e41cad364cf59814b257d04ec9a5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document impersonates a signing service, likely to trick the user into clicking a malicious link. The linked URLs point to compromised WordPress sites hosting further malicious PDFs, indicating a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://nomylo.ru/uplcv?utm_term=what+is+the+best+way+to+get+giant+ancient+cores PDF link annotation
    • http://dyglas.com/userData/board/file/mumet.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d7a4221e---popoli.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/wulujeb.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d8678cebf409715a1b66b40239cd26b0/73190785666.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/24225781690.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8c0e9bbb48b42fa76db7e9c913950c7f/lafuzisifik.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/luvarezefopukub.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/fbc79ea045cbc3202397c17577dd160c/3211943014.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/7347522089.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/dipubamozazabibed.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/03ecefc1cec2ffde8e015dedb46927b5/27068322452.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c75e06b6---rajavawe.pdfPDF link annotation
    • https://scalper.ir/data/files/file/26435680407.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/73590911581.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6a91fe5c---mosobepoferagag.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qg9q032i6itfhvdj8b0vctp1f2/67298978067.pdfIn PDF document text
    • https://t2sc.me/userfiles/61672229041.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/kel37u74rv876ib5rf6q3skml1/94771038933.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/jejero.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/60119389363.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/44052097215.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/26114608854.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dfd9804548b0369453f7602ee7ef6595/13464368360.pdfIn PDF document text
    • http://expresskaliski.info/file/43461606045.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000172f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172F5 10796 bytes
SHA-256: 8017884e60797c0bce89a969b68f3bf2d2883abdc7166d6dd8e3d899e3f0073e
font_02_sfnt_off00018be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BE1 17008 bytes
SHA-256: cb0c5d698bc5ce92b76c9bba02d417aacfb66b4003e6175e970ae67731942f58
font_03_sfnt_off0001a34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A34E 21280 bytes
SHA-256: 8589fa2fffd411a9ed60f016050e386196636408285043d0137301943e0f717a