Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab19e514be916dda…

MALICIOUS

PDF

68.1 KB Created: 2021-09-23 18:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 549ec85749eaa749a448899ce524f652 SHA-1: 0b6df6759b9ea6ee1a0de22accb8b258e3734672 SHA-256: ab19e514be916dda1b4e3998fde0501dbf4432caa8c82567e5902cfa981c3f24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple links pointing to potentially compromised or disposable hosting, identified as a link farm, further suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://losmarinoslanzarote.com/marinarubicon/admin/file/67818901938.pdf In PDF document text
    • http://seteo-dechets.com/images/file/96547897534.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/xoxafuduzodupubirive.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/92667766519.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/kasekozavelenuxep.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907164612473831.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/fupexilovu.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jajopokulavenota.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/vozanomokej.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614262f87e426---87777668074.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139537765374---xetigega.pdfIn PDF document text
    • http://artio.pl/files/files/19380741.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/bomavuve.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/suposutidi.pdfIn PDF document text
    • http://cncsprings.com/d/files/bikuragosuz.pdfIn PDF document text
    • http://wmsone.com/eimages/file/basolan.pdfIn PDF document text
    • http://journalofcritique.com/ckdosyalari/upload/files/sexonazojusatuz.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/volufaxitipefegoxik.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/pamobeg.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/kevalibowakatibawuxuxe.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/34148321341.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f45801e0---43821809694.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/64304549288.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/44942780481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+a+shysterPDF 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_off0000b03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84D 14660 bytes
SHA-256: 09033ef4f7dc3078ce42885073c29e39b469543abac394184d2310461f15f684
font_02_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 10040 bytes
SHA-256: 77e6efe47c7875d8f22beaa965f44bbf767ff0d284dba7ce3fd3e172ec6ba76c

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