Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e162c44aeff7d5d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 00:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64f8e1fbeb764e2c6f69a8900ed369fd SHA-1: 910cdb2b6fe6240719ce6d6db8bbe3c5358c96b7 SHA-256: 9e162c44aeff7d5db24ba4c7798cc42db258d2c7ce382a7bf454ccddded0091b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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 https://krisoc.ru/uplcv?utm_term=android+developer+tools+ide PDF link annotation
    • https://onlinendttraining.com/files/8258817409.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/lisamoxajufidebeliluba.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161444f62a059a---34569555658.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/tulelinaworoji.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/i682ppsgqfh1t1f8ip6r5m1sju/narebe.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7ec6cdbc229f94a9f77ef22159bd6f67/54247784909.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/70392645.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/20554729559.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/kariwevuguxululo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/24tvnjv3ci5gml479va05kslr8/74967929536.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161378062e84a5---gebulonozelu.pdfIn PDF document text
    • https://apelhijau.com/contents/files/45967154106.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/21128629777.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210910_0A86D9B6E5B04349.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/08/file/20210908_084626_152.pdfIn PDF document text
    • http://learningkey.org/userfiles/mosomelidotidujafozur.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6aaef0de15f8fde5a8ec5b16fa1e2cb2/tidogobokotozufitujiramo.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/siposetadodubu.pdfIn PDF document text
    • http://umhouses.com/uploads/files/duxixikinejetubobuno.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/rupuxalutifijevon.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/giziligikonaruroxubujov.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/72011424174.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/ziritepejufenanosavet.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
stream_003_off0000c5cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC5CC 16532 bytes
SHA-256: 0a134b8f931ac78d8d809915eab1645803082d84878618393a989abd01a71e64
font_00_sfnt_off0000ae9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9A 10272 bytes
SHA-256: 1413a0efe3dfa648c6a19be996c9a8f5778ef63ac96a9eb80dc2b0a590c20354
font_02_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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