Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdaa71ba58ef178…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 06:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a56f780abeaea7365f6b9eb3dc80783 SHA-1: 6def86da029d6181470965a6c76d8e42dc05067a SHA-256: ecdaa71ba58ef178b8a560b9f4927b9b7b9caf71618dffada79afddf4c46d264
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall heuristic profile indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=bodyguard+malayalam+full+movie+watch+online PDF link annotation
    • http://accapierre.it/userfiles/files/1454643455.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/lifasunawefunojesilawi.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/17546170864.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161387469a5d85---32756309201.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/zidokafuzinixakinulatalem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413da38619f---ximulexopadidutuman.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/82763576242.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/35937082900.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/dowatawolapidagajuro.pdfIn PDF document text
    • https://dragonexpressml.apnaconsultant.com/userfiles/files/mazifoferurexafawe.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/xigujuwikimalemuz.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/pukamigit.pdfIn PDF document text
    • https://porfic.com/fotos/file/kemevurul.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/nunerob.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9936ee3d920a55cc6287fbce5a32237e/85923696197.pdfIn PDF document text
    • http://furniture83.com/upload/files/tegukom.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/85312211857.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/lilikuvikuwo.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210923150754.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/61254583188.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/96263578822.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/rasapena.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613578f7940f1---62799858517.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/xiganotemaxumetijimonolid.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/pibatediwabug.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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 14888 bytes
SHA-256: fad2495bc35f6f7cd5fff23dcb1d893d30d3139fb16d086f9bd0caca47164212
font_01_sfnt_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 11172 bytes
SHA-256: ec8e4f38fc20268ac272024960b8f78d5ffce91f59c5d204d05077e8fdd3858f
font_02_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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