Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc405f038816bc72…

MALICIOUS

PDF

72.8 KB Created: 2021-09-01 16:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee75f522313570a7253b1c6a746a2484 SHA-1: ae0c4322587afa44364b90b34bc650c41d0b3420 SHA-256: cc405f038816bc7220af53887797973bc01258a9fb880c22e8c5dfb6faeece9c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16120180beeaf6---kenetam.pdf In PDF document text
    • http://worthingtonpark101.com/userimages/wuzozeludetajajajobuba.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f28c19b24698d6d48cac061631a61d34/52407653260.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5dbe99645---povabimutoz.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/pazefimokidivutepapik.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/67782999242.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075a281117ed---72444487497.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a15e4f5a37723994be3d283a43e19d02/sesilikebufimifadawuzad.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/62590444516.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cd78b7c953974b4c399378f70ff31985/82647737086.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/10996265612.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/50636462194.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec428257b25---dasizonasek.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/wizelid.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/wekijutokuforomamuro.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/gorubazuxulelukesuke.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/banogavonabomulepamokal.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d02796f67---80484998213.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/suzogudite.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/vufipewifakawupok.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/sajetedebofewaxuvif.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fca26865e---18251507493.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd2a483d1---removebap.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/23040412195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=class+8+chapter+1+notesPDF 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_off0000bcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD8 15516 bytes
SHA-256: 2f15a04a5ec9a613a58bcdd6997961ccffafec0d1685a41d981618031b5b91ce
font_01_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 10672 bytes
SHA-256: fed6a75ed135bef9ad32ee2d4d1812e315ee5a32e30b993a30cbad1e35fc8fcb

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