Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcd3b32980a1d44…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 21:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d86edcc834e0572398a03e2467ce8718 SHA-1: 5e57c23285d74867a5b24ac86eb0e5e217166aed SHA-256: edcd3b32980a1d44777fdd69e8932844b84772dc0c769d3001ba790a809651a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions for unlocking password-protected archives, a common tactic to bypass gateway security. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://aartipalette.com/userfiles/file/fubelejixute.pdf In PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/pibidavifelepixa.pdfIn PDF document text
    • http://dr-temt.ru/images/file/foditamiji.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/38603118709.pdfIn PDF document text
    • http://falconltd.pl/cache/file/52479247976.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c08d8c32---19852054887.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/84978275222.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/50395585009.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/50301771086.pdfIn PDF document text
    • http://emeat.ru/var/files/pajiloraj.pdfIn PDF document text
    • http://elma1.ru/!upload/files/bibafejaxik.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/fogeda.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a37fcd6c1e5---wadapuroni.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/61bd303f3671bd243d329d6edb8ea210/22055350338.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b4ca635d499f5428fd39e7c8fa9af9f9/vokos.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/pevugesumapojozabusajene.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607424f71b20e---xidid.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/gigadejekusiduzusomag.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/45497895721.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/zapirodizedukaji.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e970bfc53---laledezonewexemalalaji.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/360ca856f14547c6c27e87c18eb7f859/73195708697.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/29256421305.pdfIn PDF document text
    • https://udruga-invalida.hr/files/30469783698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=unlock+password+protected+pdf+file+online+freePDF 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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 10800 bytes
SHA-256: 6755c0ceaf267c46f35dd48b1dc729563e6c13ace2443d115dc78673da6e9af4
font_02_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 16912 bytes
SHA-256: 794ee5ba3824f75176544527ec05d0d734df17a11eb9ebad013979bf7e5dcc48