Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a24742e747e57d…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 01:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 35f140d5b15a24c3bcee029c8d64495f SHA-1: 1b92db70b26252f00b05bf1ea77823b290fb75c2 SHA-256: 96a24742e747e57de2c2b243e536ea3118c8ecfcd680161fc9a00f6e0b2831e7
156 Risk Score

Malware Insights

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

The PDF 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 multiple external URLs, some hosted on compromised CMS platforms. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://medicamarsala.it/userfiles/files/88871321410.pdf In PDF document text
    • https://mbbs.hr/files/22501052762.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ht2i0cv1ptinq739c7g66er512/gizesuwadamokeku.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210927_195733.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/41274573605.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/lederura.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/pogivobuvavi.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/fitasikutubeku.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615314fc9efad---fijisawipumewoki.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/21289363580.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/lonuxujeligajetule.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/bedudokuzijepujukabibi.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/47726591657.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/74376223311.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/xijikugimabedetebagusasu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/375e9ba61ac75402514d21b027462392/5015194327.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149a0a3a52dd---45094950345.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/bamub.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/zomugusot.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/71098765599.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/52497542708.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/51456649429.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/76596264028.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/vimolawuxasemesudutudigin.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/15143883279.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/2579070514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=biology+textbook+for+class+9PDF 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_off0000b581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 11076 bytes
SHA-256: 9065a6e3dece6befc971354b31da001e54cda640d708788ed093ac15c7e9df2b
font_02_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 15524 bytes
SHA-256: 08ce3276bf99c0bd34a70fd5ff3b8df8465284a06c10640c9308ab76f04d0ebd

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