Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e86b8880fed97a…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 03:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a38021d8d502a6d8d599db0c8110796 SHA-1: 615ec5cecafabe523aaebae2fd618f7ef85877ff SHA-256: 34e86b8880fed97a063d819302f3d24d5fb8bd48c1f6a4eb3a4b74d5ed2ff31f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=best+battle+royale+games+android+offline PDF link annotation
    • http://xn--49s538bo8ux8c.net/userfiles/file/guxeliguwodasige.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/41333425183.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/nupiwipavedawilogewal.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/5985418863.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613378b294774---8355266531.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/13127831370.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/35181389069.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/24623968253.pdfIn PDF document text
    • http://eternaseguros.net/files/files/6888552191.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161377b623c891---pamojagebegoligawedebos.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/vezawevemeduvifup.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136943687afc---89528894189.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v3dnoue46j66h2of9qgcic4l56/56073989579.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/40011402486.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_7E7151AFB02367E1.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb9f8628d---83129691178.pdfIn PDF document text
    • https://ka-base.no/images_students/files/kuzodidexepuwog.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1003989541613ffa46dd43a.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/73514329040.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fufabuporemilenaj.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/70535964425.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/rikugevozekosatokiwivir.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613003d86c098---laboderof.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_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 16796 bytes
SHA-256: a58d7a757d78d044e52f650d90f46c219daede9ec50c59ae2c88028833865256
font_01_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 11004 bytes
SHA-256: b181da810d7b54f2ce032398e49a16a2c0a7a7e9857cb92a7ca9e7aa3d3df7a9
font_02_sfnt_off00013118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1