Malicious PDF — malware analysis report

Static analysis result for SHA-256 13714d653e8a6742…

MALICIOUS

PDF

108.2 KB Created: 2021-09-02 00:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ae4ccb4cee47df5e4b7289e9088c846 SHA-1: 64ae86ccd7ffa6dc8caaf0b4867a0aadd99d2379 SHA-256: 13714d653e8a6742b612a22cd3cf107ef0c5516518ce8aa7dfb6f222e52d5d4b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and contains no readable text, providing no further clues about its specific intent beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://yanartekstil.com/firma/files/bavazavasawov.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/39a85cd3182b0454c9b069e28c08e61c/78139736045.pdfIn PDF document text
    • http://atya.eu/files/file/85372941526.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6b2876cf019bf5a51705c511da5d24c9/28853465702.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16292021786808.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/panixijapusasokakal.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847ae019c6---48760554946.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bed565e7a---xobunub.pdfIn PDF document text
    • http://w-mill.jp/images/file/55390386075.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/polidepogilizugakadejaw.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/32051936800.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/kaxarofejiwekepapumufune.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091cb65debba---kuzevefifogojenevomawi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/l663e6csmcko5p6ebp7skfle2n/45997191415.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0qrq86msb5q4lbajkvuqtt8b3c/24991217868.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/limalus.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160dde7df5f94c---xijevuduribaluwituz.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b837245b---64347557012.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a480dae29a---wosegovegotasudibijotok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb68ebf870---45737422537.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/efgji2dcrer0hojblfq13b7kn0/79636513855.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d3775e1f---97952535586.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a91f2923a80---ribijejuxalobujopufedu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1d76996189b33b7c52882afd2fc16e45/kisowegawufokolobopojili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+help+full+movie+englishPDF 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_off00014010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14010 19580 bytes
SHA-256: 4838f178497a8c536fe6c506e68cf1f5440dfcc6344f8b593b787ec917882459
font_01_sfnt_off00017313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B2A 10576 bytes
SHA-256: 4bf3f86d08267058ff2c61b80a6c436d21a631b47c332cc968d09c94018fde9a