Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0a1c58573747a4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 21:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8261b03cbb277b14990bd3950ffee58 SHA-1: a30888198cfe28ab3f041a60ecc1940ae57be6cb SHA-256: ab0a1c58573747a447bcd496fc4771a827d30814f9330dd7d5ef0317db91ca84
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common distribution method for malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=vector+and+scalar+worksheet+with+answers+pdf PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5e4ba31b94588f4efeee1ca434a054f6/41138738410.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/97732111226.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/nuruvalanono.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2106022151598179060gyft.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/nibalofufalutufemom.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f17e41afb---jenelumofajeta.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/nazexixonoworaz.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a058ea28834---63961202613.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/93764993418.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c235012220cdabd84caa71570b88fa18/5598124915.pdfIn PDF document text
    • http://surtek.biz/image/files/20150319_045501.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vejomebutijirabozazexe.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///29436406637.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/zijip.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca7378667---63435168338.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/70680007509.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/dfa34db5fad8fa906d31aef30f514252/zusarewe.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/kadomawumunafuxixe.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/duvogipenupurifegawotiko.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/980725784.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gihtjgnkvrnhtft6ufv0e1haij/6605329118.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7bb5e5cbea6be8e699284313466ae181/godufudizodosuseme.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_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 10864 bytes
SHA-256: 0cf1c9919b98189c317fe4d31346c9213d8747ce67a97df2e17322228c46b711
font_01_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 18556 bytes
SHA-256: d0b64c82523e2decbb2463904b856e30de414eac4caa6acd233d68e45bb6006d
font_02_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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