Malicious PDF — malware analysis report

Static analysis result for SHA-256 3722376b2858ac45…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 12:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2628a42eab322b9feb2d517dc30a50a2 SHA-1: d5c74055167df2c9efd35b0f6234ffd8a6c0d460 SHA-256: 3722376b2858ac4537bc670fc06fd105cef76e3be4e5374851574d6224e6ea62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://akrmedia.no/ckfinder/userfiles/files/bivavifu.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3282dd401---zusotuko.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d529f51dc28---61958404845.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210718_020419.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9b7c2a30878d1dff63b9a9982efa3a0f/55409887339.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d79f99941faf17951224e342db9b66dd/52574678524.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/wunomuxekexoledu.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/9545257386.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/39171848646.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/54645194425.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3e8c4cff---ranuziw.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/36296393497.pdfIn PDF document text
    • http://nensi.si/upload/file/vedupunozi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b68271491fa---15726556989.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f54767092---fereregaje.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/nurukupuwaromuperexapu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a69adf09---92754045765.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610979782e92f---91371583181.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/gifaroweji.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/bidafusujimefam.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a8f4275bbc3167a7ae3ed89806e23d03/34508910247.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/92480803728.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/jixuxixolokapigu.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/502b6b9089619f0904705e3e203effc2/pamogusuwuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sherlock+holmes+stories+pdf+downloadPDF link annotation
    • 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_off0000bba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA2 17008 bytes
SHA-256: 7954e9f7d6f0aa309bb6c3d1d7ad524d7fb12c995628e95f2537d8f0b68cd195
font_01_sfnt_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 11140 bytes
SHA-256: 70a7d2a7be5d5ebee451436b1046fb7e1be4a75082b3d1a1aa96dba572d23153
font_02_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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