Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fc564f3cbfa338…

MALICIOUS

PDF

88.1 KB Created: 2021-07-23 22:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e95fdaed5e0c6b91a4bbff8536382bff SHA-1: 9fbbefd3970dd13b1622a64f6cde7002d052aeda SHA-256: e0fc564f3cbfa338414bcfe5f61ff7adac716472a675e434cd0ed6775e7703d0
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with multiple PDFs pointing to potentially malicious domains. The presence of these links suggests the document is designed to redirect users to external sites for further exploitation, such as phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/1sh3f80g26h3u3ql3emh2kbf8e/tativakoposisowazut.pdf In PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/43793566707.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xosorufaluribideparo.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/51507591984.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/36920887466.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/2264846892.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/tpq6m3qdk952tacro98je5km82/14380471157.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/93a267dfc20b783a143c4f80a39c52cd/94119076794.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ot347dccmpf58vtndqoujvm557/98907382569.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/95225188719.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/88470168426.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/bujalukibu.pdfIn PDF document text
    • https://brakos.it/file/13087748210.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083df8dcc2c9---tawelidimulalepevuda.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/somod.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb95c33c100---dojuk.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a455d09fd56---jimunivusekiripoguxo.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b3bf56faa9542e279adbcc2b4b632498/75654804517.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ed3839cc---47307512791.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0007da993---99782919720.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/88109368064.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/kqagvtoolg7letskd38kbr41e3/selavuwaxokejanonebigedef.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/negonawupapit.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160afef11ec8ec---fujusapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=vedic+compatibility+no+birth+timePDF 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_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 18100 bytes
SHA-256: 909dda172b7a6175ab41158b8d1f0a45fcca119e0d868b151b65e9ddd3f3605a
font_01_sfnt_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 10836 bytes
SHA-256: c5efc6aa642de925265421a98d7903b62c23ef78bc9f410a9dd4e19b0a3c62c9
font_02_sfnt_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1