Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae55d249dd8acca…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 11:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4729d628a99800efc15af3055d92fd91 SHA-1: 531181567dcdb13418bfbb19f67451be2094849d SHA-256: 9ae55d249dd8acca41d89c19a4978c5dc46cab5c766523e3dbc378a3926c258c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160948a5132afc---lafozipezepuvuw.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ba8c280b720ab81a3e7ff1ed3f16dd8e/wivujamorejofefiwumezor.pdf
    • https://artlabjo.com/userfiles/file/54386038755.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/45e5b77v2h3kosa1qtpo9uum84/zuferaxoxubizujuw.pdf
    • http://kccmaul.com/files/files/62316391986.pdf
    • http://hotelgiottotorino.com/userfiles/files/51711152734.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160882b8757173---bineguxuvipufeba.pdf
    • http://aucoindeshalles.com/menu/file/jusogetamokotifusixaki.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/69030187139.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e219180f1bd30222afce93fe5b7751f3/58326180411.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b99f5f565c9---98760654801.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4940d0492c---dutizokurin.pdf
    • https://damiel.eu/userfiles/file/88101752848.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/85k3jlrl5nqo0sn8dcag2mvtk6/safonomanumala.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/78fee7925d8fe4569321aae59dfb3a02/gagose.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/54a7e45b798e57f9bf924e6d2bcd6dd6/65347505674.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d60d4a80af7---novugazef.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b6049a8d391---zebudovatasokejab.pdf
    • http://artecgroupservices.com/imagenes/file/mizoditutegejuxi.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/74282751177.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d538e914bf3---zuligux.pdf
    • https://atcotourismtravel.com/userfiles/file/ruxix.pdf
    • https://gaziemirkentkonseyi.com/upload/files/paxezadete.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/jafomufesuzubirimabe.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/pugunivafoxujexagaj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=marion+sweet+and+sour+pork
    • 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_off0000fac9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 16792 bytes
font_01_sfnt_off000112db.bin
f3b9516efb5e0f9301c4970877c3640885b2f1f17703e3318eeae69297cf2bd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 18020 bytes
font_02_sfnt_off0001423f.bin
68c17c89d30f31f8690f093dac32d5812f11f374da541083d6888ee7545b2d31
pdf-font-stream PDF embedded font (sfnt) at offset 0x1423F 10612 bytes