Malicious PDF — malware analysis report

Static analysis result for SHA-256 65252856454ce3bd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 12:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1561a916a036a52220778dc9e0e4edd7 SHA-1: 33b090b3840f8f0bd52e5f79ed02dc74132f7797 SHA-256: 65252856454ce3bde12d081ec0b8af1a0a3b825b66dc11d0763ed94c7c948abd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing campaigns. No scripts were extracted, but the URL structure and heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 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://archism.ru/uplcv?utm_term=measures+of+variability+in+statistics+pdf PDF link annotation
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5761a3df9---12092055350.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/luvevipekus.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/df80620011ab34c6aaf7ca718927fe31/dozowawipowelixujusor.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607078eb2f17a---kujopifuxetelibotepur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779a5bcee1a---95802834800.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/tofalobised.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202108291412389648.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/68651354068.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/madinojibetolitixopibulip.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202108211605164971.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/6e84b80c2b623559be8f76f472d2ae7e/piloto.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/pabapafuremarijigajis.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96c52acc7---funomafoba.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/56397672914.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6df4c6d4933e6dd07188f35b1e66e977/wuwok.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/43750025482.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/bowavajuvidevebasulum.pdfIn PDF document text
    • http://industra.sk/userfiles/file/linunoleselini.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/wuloxikexafoko.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/63090169745.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/ninavifijazuxasozimenotak.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16083331b29816---xajifitob.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_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 18224 bytes
SHA-256: bcbe297b6cba6334009fd388a8293e91618a3d824d7cdd873a2a95a7ded2f407
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 11028 bytes
SHA-256: 610b616ddf0edf75cb8b3fd349ce63d9053a655bcbcaafafaff9529303d56435

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