Malicious PDF — malware analysis report

Static analysis result for SHA-256 c040c8cfd56dd6eb…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 23:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ffdec4926eea59b77f3e7f2ebb108eef SHA-1: 9c20dd55a859811c58d673a66eeb2d3b7ddf28ad SHA-256: c040c8cfd56dd6ebc5a815912d569b32c75ac52785385d5047588e6600ca1884
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, many of which host other PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4d3f0ece---33022954623.pdf In PDF document text
    • http://tms-operation.com/upload/files/tufakata.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/63456814061.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/vizekatedemuwip.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086004566772---kamojipasumotabozof.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4723cbdb820ba5c53a2b122a9d5d7d0c/20573237731.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c71c80afe59a8d4cf6657978c64ffe76/nanukasulumesolazodupivi.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/dd0bde0e63029ec3bbf1eac1643d5dbf/zijazig.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/teduxorugo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f049d3fd0---bitirumelilafaw.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/kisofuwuwosoroduwi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075717a1d26d---norekojemeve.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf1ba010ae---57727730472.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ac5e2b2690---97662301729.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/lr8dq2maddn2tojm356h5dst7q/komogubokalefedekaseloj.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3492499d---56400182965.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/da7f5d478215eabb70516b7dbc23d4f6/babijozaveju.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/05dab552014ce32d884f97a9eeee96b5/73259737493.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/90465619650.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/32266158295.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/30113fc4d7e06fe966953e2f8c12c076/xutoramojasu.pdfIn PDF document text
    • https://serka.com/serka/upload/files/8829288214.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f525aa141f---vegazafo.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/95645470719.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/86464046765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sociology+book+pdf+for+nursingPDF 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_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 10924 bytes
SHA-256: 164a38e42d4bf8884018877c882b30222bc66b15f2f25c801c518afb157273cd
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 17636 bytes
SHA-256: 7fe0efdad0ee45a20114c6837676669716cadcee6ef21885e094fe66e0f018c8
font_02_sfnt_off00012aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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