Malicious PDF — malware analysis report

Static analysis result for SHA-256 916868812ad65c82…

MALICIOUS

PDF

89.5 KB Created: 2021-09-24 06:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3811ef9622cd7c2a76e320eb4009e8b SHA-1: 4123679154430fed8fd80a099f5175867f27aed9 SHA-256: 916868812ad65c8207f4d1bd1241865767eecb54ba19d7e592d9979bcb9a8fa6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to malicious websites, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=watch+online+new+punjabi+movies PDF link annotation
    • https://maintogelonline.bet/contents/files/wezisamufi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161339a1ae93cc---7456960830.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/95169667826.pdfIn PDF document text
    • http://akgdsgfly.pretty-match.com/upload/files/kusiverisavepoletob.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/42222304949.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ae43a657b2f77a22c5b44a6de4ebea50/24519143555.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/bonipavug.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/22499146670.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109201303022720.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614590af77964---73687978559.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/53251177652.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/97618953031.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16323546470.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/13716012563.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202193114536036.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/rujezunudazezabigevoju.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/79930218196.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/zexuxiwamojad.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2616efd5a---12620370293.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/goguzilibukewodivim.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/silasupipi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zejavelusibiw.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/67683369288.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/45493931186.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_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 11056 bytes
SHA-256: d3c7d43e33bb9fb547937d9db92c59d8712bdd47e598b21242108fb31359c449
font_01_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 17596 bytes
SHA-256: 22acd990e35f2f8eb0c51f914276e029c86565212d594855f2f3411e314c7ffe
font_02_sfnt_off0001401f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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