Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4f49b48e146159…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 17:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d35e910a881fe517957e451e7ba7ac62 SHA-1: 20b328a47ec7df8f28b37f9eeaae29ab8a4147ce SHA-256: df4f49b48e146159eefaa6036547f6fab879426b6c7cdce6bb8ac6e6926d13e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://genia-groupe.fr/images/files/38283403801.pdf In PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/garimusidopevabatamefujom.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a78a5f331---19456377410.pdfIn PDF document text
    • http://premium-h.info/files/files/78362167054.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/7809118699.pdfIn PDF document text
    • http://iviltra.lt/images/files/wapejajob.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/murekeragezo.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/pibodapovitenijine.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/32327f8cb9f876e4700dfcccfff6dea3/zogudomekog.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/441f91a2bb4e2c74f7b9ca9a98c09530/bekitemufaku.pdfIn PDF document text
    • https://sanagustin.cl/files/kavujaxigezezegumo.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/fatesolawoniv.pdfIn PDF document text
    • https://tessuno.com/upload/files/6100c13b74817.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/rf521hugnsvu4rtvig72p5i2c8/60537278466.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/06eca243a25745a155552fff5a83437b/45918098926.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161245e374c135---49618718098.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/36161806021.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9f605803---luluwojo.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7698c8a4bbb92339864dc0635dae1bc4/tefupo.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/wetijazejupa.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c7f489e321d1e248d05afadf67ae6828/bomegeserinezatomoxuweje.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612948c211f4f---boguxawekegupi.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/30353462853.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/wukafididot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rrb+malda+alp+result+2018+pdfPDF 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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 11128 bytes
SHA-256: a0a6f6dc243258d448ea160a3e8a8141cf9f7ab532ef9a2b783e0873c6e9865d
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 17568 bytes
SHA-256: 2ee3475ac8ab90bc715c26a6f9c8210a40c5e1f3bada8cbece807c71a2ca9a66
font_02_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1