Malicious PDF — malware analysis report

Static analysis result for SHA-256 55012bc25ed94809…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 06:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b6084828c5efa3b2105cace11763a0b9 SHA-1: 20640b3963d8e890bb4845f424f9f1febeac46a5 SHA-256: 55012bc25ed94809d78a8f19517316f35fffa0085a63a14be48039aef0c77c2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to PDF files hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://warmistore.com/userfiles/file/xowaxafomipagukid.pdf In PDF document text
    • http://galluccifaibano.it/userfiles/file/11143876490.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/66669934197.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/26826719952.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/43727730886.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pejonelidibogakizalibag.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/83226591098.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/26682737701.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/nizidupexefovaduludaxa.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/17788103781.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/38797990991.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/xadajuwufedososaf.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/44077738379.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/rugobuzoronoxujakid.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/061c3f16e89cf95dfe93620e28c7bb70/4451709602.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/bujeligawupoxis.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3185d964a---25688056469.pdfIn PDF document text
    • https://hobbypet.cz/files/file/gofipepit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e5857250---54086733732.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/15128326561.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/22280229496.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/1298011664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=office+305+loginPDF 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_off0000bdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB7 17000 bytes
SHA-256: adaf4ed15aa522ca80c9c467651b6cf9e843ecd8c412dcd7900594967ef341cb
font_01_sfnt_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 10436 bytes
SHA-256: 7e3975b175e02da3a8d61876fba7eab5f3e990465a8918e70c8f22d211143065
font_02_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1