Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2a8a19cd6e7178…

MALICIOUS

PDF

86.5 KB Created: 2021-10-05 00:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 13ea2a089614345570cd7a74fe77e04f SHA-1: 2343da22b04ffd07aaeca2f6680c8a4d099f8c75 SHA-256: fb2a8a19cd6e7178f0b2e776a57b650fe984a5ebd983d71a3f03faea187c8318
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of a link farm is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=symptoms+of+whiplash+from+a+fall PDF link annotation
    • http://zwickerfoto.hu/_user/file/tozevugixudak.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/doselub.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/66690622691.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/99874295896.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16145232964796---xuxekemunixawagil.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615359585c7ee---xidotumavonu.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/53687649238.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/61374626552.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/57940970674.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/31614498438.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/58099323095.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/mufuteturebaparefig.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/54236417261.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/fe4d4d06da5bb65c99466e9c8d08efad/99135664205.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c51f242866---24523190512.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9a8eb4b7d47f6fa9c6fed47ba837eea8/vefatoweripimutawu.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///65701693318.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/13258242014.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/86974339295.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/49660256833.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/jutapiruzal.pdfIn PDF document text
    • https://dienmayngalinh.com/img/files/55356411159.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c60a45ecacf1f7c40054d3312a54c649/37258296572.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_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 10664 bytes
SHA-256: 997ea2c0200719c2a8822580f1d94101d176476e2815a32f07a812db3e7b9169
font_01_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 18052 bytes
SHA-256: 4e0e1b22cf06e6e6f474fa4107f46e2ab043872cba6ba2fd548eec7eeec7893c
font_02_sfnt_off0001343c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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