Malicious PDF — malware analysis report

Static analysis result for SHA-256 4637c7b277c3ee16…

MALICIOUS

PDF

79.6 KB Created: 2021-08-03 19:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c4c438f48f2378916e435a69f08f4899 SHA-1: 26059a8301fee178f4606778915832c9098aea41 SHA-256: 4637c7b277c3ee162fd34e6ee5989169382adbcc93f09d7062a16265f5c13259
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or scam campaign. The presence of callback lures further supports a scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://peintures-descours.fr/fichier/files/xutuwuzoralupu.pdf In PDF document text
    • http://daivupaint.com/img-chamthi/files/34683823484.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48cfb80b5---wafedowinaxo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xomepizovexepifemi.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/014748ee375286100149f992fa42a19d/87039151157.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/66733925731.pdfIn PDF document text
    • http://www.centralperdana.com/file/gebalazadokajamasozube.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/tegopesepojixetozulowa.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da9057913b7---xazevenilewulafu.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/21472573066.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0852ede02---rutimegosa.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/12098078427.pdfIn PDF document text
    • http://debten.net/UserFiles/File/21284753876.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/wumoweginakibuwewebox.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/95582856361.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da5fed65872---38411611606.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/0lmdr8j0f2m9oc6ru77kobhatm/vowaxemalonatojep.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc8f55bec5---41843186263.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/37350280826.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/kejitivixofiloro.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/77848864439.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/jibavedizupukofedusom.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/83503014011.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/82853762099.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0cadb0c5---1174553038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mitra+philosophy+notes+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_off0000d2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E7 17276 bytes
SHA-256: 11df06db9fd800f5392bd717f7bac7ae7c7b0495ce1cfbb561c6f3a4fd0b029b
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 10700 bytes
SHA-256: c7c640d38c11ab809668296a2e0b52c514608ffdbb5e5375322c960e4374e545
font_02_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1