Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a1f27aaad6e661…

MALICIOUS

PDF

83.3 KB Created: 2021-07-02 10:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad0a6a8d7cc16d9e400e82658f69efbd SHA-1: 7a53c52a1e7ccef879204712e8031f2227dfc3f1 SHA-256: 38a1f27aaad6e66157cf3050cc40416869f28bb7cc74e5ef72bf02c593003f6a
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and IP addresses, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm on disposable hosting indicates an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://cdhsalumni.com/clients/28864/File/30457976224.pdf
    • http://www.amedna.com/userfiles/files/96074277222.pdf
    • http://nadiadsa.org/userfiles/file/xesixibar.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7e260f0b0b6c6e432f5d8a2d2c1d6b41/vunapabugiliberawaduragam.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/47v2pp1vbsfmpdq7qp6uhdpcn5/xajajakeborefavekorebu.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b83e7df06e4---93531745385.pdf
    • http://daikinhbac.com/upload/files/87925498809.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17811a333---matisirozapete.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afeb1b9b47---40704132552.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4bc140f1---vabefudifividu.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/vopimumopesama.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/62845623393.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/nl1r3jajk571p5cvinj5obad2m/89979345427.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3277f27813---46274123798.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160843842e6277---41162086465.pdf
    • https://digireg.it/upload/98472914888.pdf
    • http://tnslib.net/userfiles/files/38379813190.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e6183586---zefenelivekokedonebixej.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf2a31b71---31878003707.pdf
    • https://grup-insaat.com/userfiles/file/mavixiwineledasezurase.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/25916985776.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/dixiribavodulekobumorasew.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16078796c4754c---ranug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=homily+for+epiphany+2021
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 16792 bytes
font_01_sfnt_off0000f8ee.bin
ce7f0f9f2bd73ca891248b80b9fc5c93af82122fd3558d78f23d80cc60e6a8a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 17016 bytes
font_02_sfnt_off000125d6.bin
68e7a6be43bff058504003d9ca9a83239ef4cc46be1c33d76849e8e114ae4da4
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D6 10756 bytes