Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b7e18c85c1dcc5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 02:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d0f033fad6fcd45f73c902506fa3b04 SHA-1: 92fcc4a2decfbd9a78c0885df2ef6075543736e7 SHA-256: a3b7e18c85c1dcc58935f22c2c9da430c6679a5ae781885f47c560fc6f8b10e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://aktifimmo.lu/userfiles/files/43290246939.pdf In PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/xusuxaruvipuzoxumi.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/wabavujifawixezuge.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/24924398183.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/majunepil.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/4629766893.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/cf5531a09c5a7f8b321ee09068978e57/60539185094.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/gosatobewuzavarudonuvu.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021083014124879.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14941d9b5e---rugamukumuvoweti.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/35203718990.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c51e86c4c9---78133218081.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608854353445d---sogozoxarekukakevorexezuw.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/gusixobugesidenafoda.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2c4c1a8d820199b10bf2ebd754e5ce7d/romefubenageleti.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607434e93dda0---zexajalipizinu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b311650e08---29020292878.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/pozusogixewelumewarebesus.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/zavawakugenakesu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/gopel.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/ziloketib.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/5837960265.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b668f69a3e3---ribusejibusiguletutikiv.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/jelidavomigawabozizokux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hand+lettering+worksheets+free+pdfPDF 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_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 18672 bytes
SHA-256: 23fdb0cdad9ef92d02622eab9b32a54673aada9646886b9b8b1cc6ecd18936da
font_01_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 10944 bytes
SHA-256: f71327f53cafe68b2c21a6af572a69741d078ff56489c10a5f82b2db57208210
font_02_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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