Malicious PDF — malware analysis report

Static analysis result for SHA-256 f426d917be647d1c…

MALICIOUS

PDF

84.4 KB Created: 2021-08-24 04:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b323aeb4786fa09e6acb6f570abe2a30 SHA-1: 7763d57a5cdde6797be9be0d0f1a35c2c2ddb6e1 SHA-256: f426d917be647d1c079a1615bcd3e05fce6fb38d5ac0eec01fb960d5127df76d
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ek9m989kg89p9hsr5n88pl4h26/xuvadaxevoxisukepuru.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e87f239975227f7ec3a900c826531d00/29438597318.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/12707317064.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210708120832_e28btg.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/2857362909.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/bojupepelipuwiwuxib.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/6818763375.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d8o0i6p1g0hsho2of4fkb683s0/59902863661.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1a3d5c655b56d0681d1584add92ce494/3298637054.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/titemotoranizuwoj.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202108131349589544.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c04a3550f28a1ed636d2791a3a7f0e61/55051962983.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bd8f39682---39639434265.pdfIn PDF document text
    • http://minerva-collection.net/files/files/62647885960.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/99554084796.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607155e4314a2---ravefexog.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/81832169706.pdfIn PDF document text
    • http://asid.rw/userfiles/file/26893610848.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9fc98527---68899848294.pdfIn PDF document text
    • http://ipceurope.com/assets/file/3055291310.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a39c712264504a3729f6cc2f43cb87e7/vuxelojewabu.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/70445464538.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8c0892654e26f54c5c4cf56a32ba0286/dubediwupamik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=10th+geography+old+book+in+marathi+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_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 16804 bytes
SHA-256: c599593e045186d425259a2a642e07720da6b00055996cec5d9dd2ac092a115a
font_01_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 11200 bytes
SHA-256: 4f40930293c282d85795b3193eccce3fe35de15c1c07b1730534a6952e2682ee