Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e9f2c47fe0cdda…

MALICIOUS

PDF

83.3 KB Created: 2021-08-28 12:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c193492b1ebe2a2afe413330f626f0fe SHA-1: 4170bfcd97ac1b1cf5171c4675f32943d9c01ac9 SHA-256: 18e9f2c47fe0cddae538022b1dd61f052c9949c5c2703ee9a55d64d4276e968a
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b520bb0b---70623736718.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/iohcm9ucfbu822a1m71fkk93k4/44098537635.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/466a92d9615b43480d4452e5033f85ff/pixifujulagizitereju.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/5755115845.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/gozoxidivasuzez.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b1c3ebed1---64801734304.pdf
    • http://ecohouse-lab.com/userfiles/file/fapan.pdf
    • https://nepalimodelagency.com/userfiles/file/xefepakaguw.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa5430524---fujirufepir.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/japikefafetizor.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f7db0c6b---44690322524.pdf
    • https://nasikampung.info/contents/files/74348048995.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/2888154831.pdf
    • https://alarouba.com/ckfinder/userfiles/files/ruseduvi.pdf
    • https://bem-sa.com/img/file/85774804564.pdf
    • http://amexeuro.com/an3_Uploads/file/bowagokezakid.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd441f1814---xesofutosedosuraxaroxibo.pdf
    • https://dentalrud.com/userfiles/file/31127895070.pdf
    • http://blpest.com/UserFiles/file/94011658251.pdf
    • http://hiniceshine.com/upload/41946662385.pdf
    • https://cowichanseniors.ca/userfiles/file/wutafuligulutifu.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da96b240d86---tezarorapebenova.pdf
    • https://tangente-mag.com/img/file/kagapebaludokakusanunanen.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160930c09bebbc---20742091094.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bba14abe14267a08a68f4c2bb534659c/litavubetuwowokogetuv.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f301c76ca---78807972877.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=graduate+diploma+in+professional+accounting
    • 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_off0000dbea.bin
1156f903de72739b25c4fbabdf93f8983fa87b1ea7b5a3972e654c364411864b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 18860 bytes
font_01_sfnt_off00010cb6.bin
c07a7dd71f98155a53d452b09610dd19844fe765218d2ac97b5614c019e04900
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 11100 bytes
font_02_sfnt_off00012661.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 16792 bytes