Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0ffe4914ea50dc…

MALICIOUS

PDF

106.4 KB Created: 2021-06-30 19:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 021b8e5f2735bb76d6a5ab0e8014c913 SHA-1: c875f0f5c660a787f583cc45798c0235203acc38 SHA-256: 9f0ffe4914ea50dcd23ea3d1b713414f6701f3f836d6f810b1ffe80983b644ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads, suggesting a link farm designed to redirect users. The primary purpose appears to be distributing a second-stage payload or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a23399f6---dapivapakodo.pdf
    • http://i-dron.cz/data/file/wigovimi.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a132c7bd615---75411178705.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/976e66f99013c1b3b6878d0cedab950c/31858587819.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56518652a---vutakakibafapezufitexo.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16088becc1ebb7---26783501588.pdf
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/1979c725b751d96963cbffe85cfe1c3a/28944078068.pdf
    • https://anmoul.com/userfiles/file/20295667404.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/9cb3086a1de43b526ea6dea60eb3fbbe/24250915424.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f8eca170---64426330052.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074900381ad5---kazudewegetugiwotagogugi.pdf
    • http://cuspsurgeons.com/userfiles/file/46563789121.pdf
    • http://galluccifaibano.com/userfiles/file/87581458367.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/f11ea2228baf0d61f78eee0fcf4b6699/xapap.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/561ql27e1thohk82obsll346d6/dimet.pdf
    • http://garage-fuji.jp/js/upload/files/duzefojalifu.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608903f963089---gewopulebem.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6786e3316---3310589961.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e7813384235bebdf2cbec95543dc2d71/53723182400.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ng30he2vadlc6ehl80btcckgh5/20563891811.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/5e114819efc7704be1ebf8a2a16851a4/94648666357.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f79c5fbe8a73de5ac6b1221c4acc6497/lilirafasapunawut.pdf
    • https://citytrafik.nu/images/file/tutine.pdf
    • http://sl-light.ru/design/img/upload/file/75471633116.pdf
    • http://arch-teh.com/pic/userfile/38017256253.pdf
    • http://xn--80an2aej.xn--p1ai/up/file/81336887301.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c16035a1713---vikamibarido.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=calculate+static+friction+coefficient+inclined+plane
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d47.bin
707e259baee644ddcc4a1d8e413021c18fb35cf50d61cbe511f62e842cfefd7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D47 17264 bytes
font_01_sfnt_off00016a90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A90 16792 bytes
font_02_sfnt_off000182a7.bin
06e729f2585c2e79ee243d946b73eb3d75db78c23875b56fc84882c1e3c8f5cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x182A7 10744 bytes

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