Malicious PDF — malware analysis report

Static analysis result for SHA-256 6383e641d12c5307…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 10:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6907c3719f6d1e84895376491c060891 SHA-1: f3ab55953d4690eebaf1595339496a69cb70a924 SHA-256: 6383e641d12c53078158565ee178f65b48359aab6e25ef1b8bac1afc9c9fed9e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external websites, with several heuristics indicating a link farm hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or redirecting users to malicious content. The presence of external URIs and link farm indicators points towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://transdeliveris.lt/userfiles/file/xurewuvofaruwatisevomidi.pdf In PDF document text
    • https://korzo-galeria.hu/files/file/gemapativemufu.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/93075785672.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/jiminalaxuwifakoxokovu.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/4133209045.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/wunezuzejopok.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/5061432073.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/98179744268.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613078fcdbf97---36779229154.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210916_205835_152.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/widozarapasugasone.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/vonogole.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a1g18v4sa93tfrjld3dgj1t2nb/pekazololofuwa.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/38569169412.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/3261097629.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/80888698785.pdfIn PDF document text
    • https://cargotavio.ru/files/file/2869241326.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/1650218173.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/wusukibupazosika.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/wakisitafakafagogixisa.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f20eccea3b---lubumupuxogifototaderoz.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/aedacee7522231a042ce7640131048ed/10155088405.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/99681708491.pdfIn PDF document text
    • http://asja.ua/userfiles/file/9562197324.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/jedagana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+make+desktop+mode+on+androidPDF 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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 10676 bytes
SHA-256: 7c8d5c871ec748cfd2a69e604c91c8c0878ea3680a769698873b6bc2e4cfab1f
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 18316 bytes
SHA-256: 044a4c0cb08da7e1a1541fe043f05df28894fc710db00b04abfc359e5c7ffed5