Malicious PDF — malware analysis report

Static analysis result for SHA-256 f490842838f31a53…

MALICIOUS

PDF

88.2 KB Created: 2021-10-13 17:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 88bd7e49ab94e34568bca0ecccaf15d3 SHA-1: 6d154be8c2def01a566761f1f6a4c9bc477916cc SHA-256: f490842838f31a5309e11f070489af6dc89a5e574e93626948e8a784e34ee949
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting a phishing or redirection attempt. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd09d9bd9---19439850149.pdf In PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/fowupozinukotatosinos.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/rifokeperev.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/zoneludurosugodotukinon.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/22381024162.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109102104196664.pdfIn PDF document text
    • http://k1a.ru/images/files/file/mebaf.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/10347493118.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/divexowawanovaxixa.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/xidumeribabakuwagubetavu.pdfIn PDF document text
    • http://esejsc.com/upload/files/90490431680.pdfIn PDF document text
    • http://pasted-radio.de/web/files/99367461072.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/59060707787.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/76729734567.pdfIn PDF document text
    • http://holzbau-napetschnig.at/tezovebosog.pdfIn PDF document text
    • http://weingut-suppan.at/files/75109075435.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/99123814613.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/jipibix.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/58388795126.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/17871067158.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/lopamalejoz.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bc4ddacaec---xuwapovoxurezopoxatoxi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465f69745f3---jakim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/896FEnmJZlk/uplcv?utm_term=which+cats+purrPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ae0ceaff80cb7166568a6b2e73a8b23a/wilolog.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 19896 bytes
SHA-256: 1db767029b6f11ba3dc0f5abce0c3b2ce5b497ee73d6ab791879a57a01ff39c9
font_02_sfnt_off00013d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0F 10164 bytes
SHA-256: 77b5f3ce32897f8dd7f83676668de1c8ff531d99c21b7f569b0b765ca12d3b48

Open this report in the interactive analyzer, or submit your own file for analysis.