Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04cb629a221f6c3…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 02:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b7edf8c33808d6b260040cfe0e71903 SHA-1: c43d1a4258b123a4c205fb0e0d0cd0a4c75d951a SHA-256: a04cb629a221f6c3431fb4e4a3e74336fc98a2418e6f8940f3ea051c8d06f726
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=how+do+you+update+apps+on+a+firestick PDF link annotation
    • http://flemingdecal.com/uploads/assets/file/ruzifulazarozesijigab.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b332d7a4d6---gojokuponovufakuxeto.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161359d08bbc57---sivosonututume.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/83603979763.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/sunadinufijajotuvemed.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/mamuluva.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/28578920113.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/gerowuxotunubaxu.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/rifidezumitenunukasedosun.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/46149802256.pdfIn PDF document text
    • http://altinay-law.com/images/file/napofuzomunexebabisakuli.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/74397745499.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/sagokepifil.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/46544026073.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/somafukevapewamowotag.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/9861250823.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632114789.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/nufomijozotu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/022b785b312fbb2018e3c2622279bb70/80854462468.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ntfbnlf91m313meej6vqaj02r5/namagasujupebibuwon.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/widogulupowuwepuma.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/velifusakurar.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/93694991020.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/14152333539.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_off0000b19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19E 10948 bytes
SHA-256: d6999c5f20d97055dfe570ba6c2c13f32588cb17199023ba53db0b4a291c4705
font_01_sfnt_off0000cb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB39 14676 bytes
SHA-256: 1736f4fc49b6f340c803c4ce3ce4be907e642746be5895b87186ab1ebb0e2b91
font_02_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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