Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fecc68f38a1b8c7…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 20:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a105e91dad5a982ab8155ef53984bf47 SHA-1: 12c1f02148f28b7c0de4f1a6aafcc51f81ca6cd6 SHA-256: 6fecc68f38a1b8c76d071bf6df1c5d6b01c3894ec6276e5029a4cf4ff89b2864
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://ttmplus.com/userfiles/files/94055965922.pdf
    • http://atthaya.com/file_media/file_image/file/12806231465.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/42386209571.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/70251820228.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/ketukelo.pdf
    • http://www.knickmeier.net/images/pageimg/file/82047310731.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef89f2fde---viwareruvatunujibivog.pdf
    • http://phpirateboosters.com/clients/867602/File/lezarupowetegake.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c514caa4993c13694a83eefd109f156d/33422672153.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8858472c---mojuv.pdf
    • http://aivieksteslaivas.lv/userfiles/file/junuwo.pdf
    • http://bassbasement.org/userfiles/file/12615680061.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9759glgvtq14g4m1gp47jnlgnp/31395946788.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/95383171344.pdf
    • http://barsugo.com/ckfinder/userfiles/files/91776444985.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d74fa2ae1---sibixipupeburitibupa.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5bd4eae69f103fbb27039ed034c5ff1c/31712848095.pdf
    • http://villa-carlshorst.de/sites/default/files/file/wurutubowaniriz.pdf
    • http://fixafilm.se/userfiles/file/xikukono.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0497bcf13ba27945eeb2e75336f90a40/76386219947.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd70f8a2ca8---jaguse.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3da65ma64ghe1tpjsitre3ak02/ledetidoxilusu.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b786698c139---gubixulodozufag.pdf
    • http://fatamorgana.fr/uploads/assets/file/fusurokimirisa.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/1mpadu2o7kph3a7k6fofjsvvtp/dawabibajibujebid.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af3f657bd5d---21610207031.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829e6024d33---48446827934.pdf
    • http://abc-tel.ru/data/File/55680083109.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+uses+of+sulfur
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe88.bin
e2cee48661097463e1e78f8d610cdc113e3236231960eed589726e44959a2c3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 9916 bytes
font_01_sfnt_off0001149b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 16792 bytes
font_02_sfnt_off00012cad.bin
0de53992dd23270866c181b92f23eb7722cacaec857f751dd6d2ea4fe59f92e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 18244 bytes