Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ebbcd512b7c40d…

MALICIOUS

PDF

84.1 KB Created: 2021-08-19 00:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e3b30a2b58470ec9b6f875b7d8d0e38e SHA-1: 2cd919cd0ab30b9b119d40e5d0472e836aaffa85 SHA-256: 22ebbcd512b7c40dbff6d9df21ba945491a14fa57e2e0a1101948fd50b7a703b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting domains, indicating a link farm for SEO manipulation or to host malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded URLs suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://alhouti.com/userfiles/file/58133472734.pdf In PDF document text
    • http://industrialsupplies.pk/userfiles/files/sovelobepegak.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d07e9974909---3272218713.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f17cd125---julibov.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8088d42d6a6ac4267f9bc7affcf15d9b/bikugox.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/rodotidapokizov.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/sp115mur9jrbd1c8ri0plo7rdt/rofijopebisubaxasobefelu.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/9586697973.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210709142205436.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/bf83c9812177a082f710c54aa6b78f26/59369310889.pdfIn PDF document text
    • http://ceroki.com/image/files/vufalowajukokeguwuvoka.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/59837517496.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/megenitakamajiwosifirutu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aa799f4d8---panurobelovifebanojuvexo.pdfIn PDF document text
    • https://defaico.com/d/files/40250617132.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a20819be---83755373138.pdfIn PDF document text
    • http://podarox.ru/public/files/kawaru.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/21894832427.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/64838451809.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/94180174973.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/700f664d8f70d8c5ccf970c755034151/tuxisiz.pdfIn PDF document text
    • https://peterdegendt.be/file/77797317747.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/p4l0gpqti5heorntjnbgvft8a1/25231597442.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/84042286092.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/rojejinosazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+write+a+letter+to+bank+manager+for+cancellation+of+credit+cardPDF 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_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 10960 bytes
SHA-256: bb0c97db8e41506d04ee11c39e405c98bd15e135cdc68c8dad91f7c2d033655e
font_02_sfnt_off000115c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C5 16772 bytes
SHA-256: 93b9aeb951f281632508be71e0c7b8974f05180b412eec7e163341ba2c81c7da

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