Malicious PDF — malware analysis report

Static analysis result for SHA-256 527e7c5bd6283b86…

MALICIOUS

PDF

100.8 KB Created: 2021-09-04 12:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b5da416d03627d961fa1b9d0779f97b9 SHA-1: 91c13f56ea5f8bf5711b76168c27eee8e1dadcff SHA-256: 527e7c5bd6283b86eee37c0f09cc505eb76ebe906c4d7bc239eb8f021a693ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farms suggests an attempt to deliver phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://crossfitbeeshark.ro/app/webroot/files/userfiles/files/70695067985.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b553b017511---83650879342.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/70744630585.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jdtahhalln1jme3r51lsicakd5/vofawivarawujugaxulelit.pdfIn PDF document text
    • https://medius.sk/userfiles/file/xomokukejaxefezu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/80ee5a4a7e4a1c97230af2887ec9c973/vajej.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5142f9ad---zevogoxubububumaza.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/kofapudetiranovizumiv.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38ce609894---voxotemu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0cd8e850---nebolofiwebi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a1c6ddc74d3b3517e60e7a15fe5920c9/xadazasovolodo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610734437520c---duponazexejuvapomolapalo.pdfIn PDF document text
    • https://ip-pharma.net/data/files/nituvusifoxanube.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f73a39b06---burebokovuzopexuxixuzad.pdfIn PDF document text
    • https://clubon.top/uploads/files/dupawokekexejedalimaxadi.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/fugitiwukebuner.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/sokunevexubajixiwigare.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/20c20aab40118db36f72bfc9efaaf781/6210872835.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/84482404022.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/napifipex.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16082e831f3267---xebetasuxawegepa.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112f9cb42be9---14213479239.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/54411532742.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/vanuveropuwaborukepiju.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/68613129909.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/lagimasupanugikupar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+crucible+act+one+questions+pdfPDF 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_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 11068 bytes
SHA-256: 6184abbcc3b08780aeb1d2b4d2659628f325b43bd9db5def8084e478601a1384
font_01_sfnt_off00013d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D93 18772 bytes
SHA-256: b2c392c7636da34c8986c91c0d3946046c9b702fd0c3496f0d7c81a858acbd51
font_02_sfnt_off00016d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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