Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17aa311e5472404…

MALICIOUS

PDF

85.0 KB Created: 2021-07-06 03:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 50908db196bacc439384247a880c294f SHA-1: 0d86ef103abf03b866e35c3468efa043cee29ded SHA-256: c17aa311e54724042c967fcf8d13219e6adc8bbe3c9b9821942653bed62499aa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a01116b1---35212980019.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b918c37e67---wavufiwomaj.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/84359830887.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609811694e7b9---nugofeditap.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/gu6v3s8on2bvj788kl8cgg8ip8/37104073000.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/go10nm3for2edih07j242gqaj3/3866853788.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/rokakekatevinilowubus.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/sunakovoxajevodawa.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/99870379941.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/324f5df633e1743b5748cfbeeb1ffc5b/33616578631.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a745b1958ff---19696573240.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160740abf111e1---21701868547.pdfIn PDF document text
    • https://aspirans.com/files/file/jajotozosixunenuxixot.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/43240844172.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/kogodeperupetuziwagexarun.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/22228457404.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/sasuxuvas.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/buriguxijevibubufufogu.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/migagapafo.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-31/images/files/buxepesukoz.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813821360cf---babubuzevux.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9aa5fe9a---bidesuwilobejifi.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/41258822758.pdfIn PDF document text
    • https://aspirans.com/files/file/72670225326.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/6636940745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+witches+2020+kristin+chenowethPDF 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_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 16504 bytes
SHA-256: 95fe41f7dfcda799de0e826927d906eae66d0018831582e8441ffd9216177061
font_01_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 10504 bytes
SHA-256: 3737c7e70b7edd3332aab77065045c52eae0811f70270703357a035ccc333301
font_02_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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