Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3ae0418e2b2794…

MALICIOUS

PDF

68.8 KB Created: 2021-09-17 17:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98b42d9d40477fe51c3fbae2474c89ad SHA-1: dd003b7d55f61b41ad38ff7e38b19cd4aea181e6 SHA-256: 7f3ae0418e2b27945a6244402326c8a973069057a182896f101ad694d5c68656
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt by directing users to potentially malicious sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://cructi.ru/uplcv?utm_term=can+you+recall+a+text+on+android PDF link annotation
    • http://mgtofubbq.com/uploads/files/21174120911.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/27146135502.pdfIn PDF document text
    • https://digicpictures.com/downloads/9803360132.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/1324456101.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/gukajulil.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/84906933425.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369cd200e2a---654241986.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/fawojapepelubuxiz.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/44987528152.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/94853338606.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/lalanotavomuwofawisogules.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/54946679519.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/dogufoviwoxu.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/86213235106.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/dikevewepoloto.pdfIn PDF document text
    • http://freewest.at/99237047956.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400ea8a6ee7---neditozilalazinikazowepa.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/tipopafenejade.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/kopupazataxasu.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/65009643642.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/xebadelirare.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d430a95c73e361c27a09063b37616dcd/dosezimenar.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/gufomewege.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/58760182562.pdfIn PDF document text
    • https://toocapen.com/files/22475464396.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-14/images/files/fosomawaxonajukunakefu.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_off0000b1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E5 14224 bytes
SHA-256: 7e6e1580f6bfd804e2f9d5c9397101ddd6381e224965754a29553da6f7baaba5
font_01_sfnt_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10544 bytes
SHA-256: bb07550770a931f7fe71f4e8a6480718a9a1b16f8287124afc7bc55ce9b78471