Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dd7f60e52dfd44…

MALICIOUS

PDF

70.4 KB Created: 2021-09-22 12:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4928b026ed2400e113943191cdfbde1f SHA-1: da2a94f9bb30da8872a6b293c1360cfe6d91892b SHA-256: b9dd7f60e52dfd44cd3c11358c2b10f5900fff074e64cf583dbad8651f9b302e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://philabc.ru/uplcv?utm_term=prince+of+persia+the+forgotten+sands+setup+download PDF link annotation
    • http://1night2day.com/ckupload/files/31226692527.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631738949.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/22568168408.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/39889280579.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/kezisiwobojimuvisilafefes.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/wosiravifol.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/faboz.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/devanepeto.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30788a6d9---31238305825.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402a503aea9---buzewedosabudekatukuru.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3081ae7c---41497020420.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/74818227473.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/85273271654.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/76335352097.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/zatewig.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/rowuxunavejexi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138418193266---82294681940.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300093657c7---lubozabisobobivejat.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_off0000b113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 11088 bytes
SHA-256: 6eaedec2ab44652c917b6b8ac225530a2b2a78cb87559740e6f4057a7ab620a9
font_02_sfnt_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 16240 bytes
SHA-256: 0a3e1ce339627d5111dc39c1ad8b1e841c2146885caec4e3041ca52bea88a556