Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc7152a09981ff7…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 18:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1955463e37dbfa4daa70a297346291b SHA-1: 712cd48ec23d932535f1cd0365323c327369a24c SHA-256: 9fc7152a09981ff74516679bc01a75f0dcd0804cae3912a63920eb1c2674a36c
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to host and serve malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://theurbanbazzaar.com/userfiles/file/pisizemozolutanitufolevo.pdf In PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a048bb80e437817d23be1394a66c3b8c/lozexek.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d5f0897b7---rozuriwo.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/284656824.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/62939975023.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/sazejelaxizabakija.pdfIn PDF document text
    • https://coevent.ru/upload/files/lojusibeguripejumonamedat.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/rl2259f808bskrpqgrm757gqdq/semusitelabeziwigepot.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/xasutemabarifes.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/tak81douv25gsr8qkhq4ntsbr2/zineboxiwisemebawuvevim.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/xevovuvekonedu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d60453178---wajapesezuluzidexotu.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/safedowet.pdfIn PDF document text
    • http://wernitznigg.at/files/79372717263.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3a32b7c1---98572433365.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/kanusebotapevejejenube.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/c16cb46e10e6b95da5657ae7f5125d3a/vuravubevasuxu.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/89206787546.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/suvewobinafav.pdfIn PDF document text
    • http://bociany.sk/media/file/79007686863.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c558d748cda---datoso.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a0fdde6440243a6a7e61be177e1a00bd/fivogavo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e44f2e73e---72772465491.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f9dc1a4fb---78674425767.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5bc86512a---jebiwofonavemoravuboxiz.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a1f3d3b1---mobesopigivuwudop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=delayed+muscle+sorenessPDF 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_off0000c816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC816 17312 bytes
SHA-256: 7f48a0c01018f227bc71f7f7ad835ea7d5cb69ad2f0148cef77269837b2f2fc8
font_01_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 10556 bytes
SHA-256: 01595652e60549442243a312fe04615807b61d67bf25fd812296d3bff91aba3a
font_02_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1