Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ef875e3f1ad6b6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 22:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 520bc253175f8fb0607c1d95cc266e49 SHA-1: 4e07ba97772c731486e7ff208b5b85ea53c48e6d SHA-256: 25ef875e3f1ad6b6401ded1a5159582675c7b2938ac3861324c48c2249500956
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating it likely contains malicious content. It functions as a link farm, with numerous URLs pointing to various domains, including compromised WordPress sites. This suggests an attempt to lure users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://synerhu.ru/uplcv?utm_term=name+last+name+surname PDF link annotation
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/96285687179.pdfIn PDF document text
    • http://industra.sk/userfiles/file/zatedepapudotomajogeno.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef6db0c1e3---sosubujegexaziw.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c33eab12df---sadumodirobugowopole.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/29669099520.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fazakiveliwulal.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/zugasiz.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbe8f05af---somolupolusajefimavulile.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132f40b0ac32---fezojasolijelenisokejijiv.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/fufuvamigaluvu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/weweje.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/voledasoxigixinote.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/kunakilovugo.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/55287262178.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/felawekupazedib.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/88458237027.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zodapeta.pdfIn PDF document text
    • https://flyags.com/editorResources/file///92472253793.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/52295415940.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/fufujobifibunuzunimetozen.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/kabupirex.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/88525542235.pdfIn PDF document text
    • https://salwangurugram.com/files/31095697791.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/be53e88e1043d9f3a484317ca96fbd08/zifaraletosodutabujul.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/1728171762.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 10136 bytes
SHA-256: d6bc7a780efba8d07d4d8ffbea89837b4de2df43dd55cd91b8132b1c0191589f
font_01_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 18032 bytes
SHA-256: 49453be70b98ddc672edf071057aa15adf65236925dc7bc9b70edc4751813d09

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