Malicious PDF — malware analysis report

Static analysis result for SHA-256 82673b261685d676…

MALICIOUS

PDF

79.3 KB Created: 2021-07-23 18:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d900a3c8c1a92496331cc5957acd59e SHA-1: 877bc40ead05429b7194095285f6ce0dca9d6f8a SHA-256: 82673b261685d676cefe3c23c4cf5b2ec4540bcf4a6f3f54df7eb6d74a27392a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://stpeterscbs.ca/ckfinder/userfiles/files/mejaxapufufaxosam.pdf
    • https://cabsfromheathrow.com/userfiles/file/23501700924.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083de8b883ba---9729070108.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee55fa3e61---dojofexaxusinepufusi.pdf
    • http://abwmountvernon.com/uploads/files/41340488506.pdf
    • http://sahamit.net/userfiles/file/42395906275.pdf
    • http://szwygs.com/upload/didadamusupig.pdf
    • http://littlepearlbooks.in/data/eimages/file/91720800111.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ce7ab4e29f2a48a8aa7d3efd3987f6c1/xegolo.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0899083a7881b37733626466fd40035d/tozodidanelitomu.pdf
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/24222854475.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077db17f2791---jitetibujodu.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/dawidosekadokawudomufo.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/151cff4c2b5bff55a0416f90a88210bf/69119969342.pdf
    • https://rachelrom.com/rescontent/file/labulene.pdf
    • https://alyosserspneed.com/userfiles/files/kezujobibukurewirizijege.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee922eb4ec3---15325896202.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/s8bpbomi8e00vooo90pjrabis4/saxudinebaxulod.pdf
    • http://healingtown.org/userData/board/file/44889392556.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf2ba7a33---gerilavezonabir.pdf
    • http://alpha-th.com/userfiles/file/medagober.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160816d196b6d1---28277218197.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1fa8700e482366c01d8b06aedfbf0383/manunesuxojeruvolunalox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bicos+tesoros+los+cabos+resort
    • 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_off0000cfab.bin
02c16dfa272a149bffff019bdd51ae78773efc693d23a2eec9db4d414f20efe0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 10312 bytes
font_01_sfnt_off0000e716.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 16792 bytes
font_02_sfnt_off0000ff28.bin
5a5e602ad17466167336c7e634750c3f4c9fb290edc679d77bc695c311aa87c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 17916 bytes