Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e756345f80ddad…

MALICIOUS

PDF

88.6 KB Created: 2021-09-01 06:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc599692df3f2582dbc1906c4f6664f2 SHA-1: fa61bd85153aacd28531f4d17cb57c6f9d2f2459 SHA-256: 45e756345f80ddadb4e6710317fc489eccaa6b7c4ce1d845b6f9d17122064ad7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1d568649cff1ca64b9bb2db58b244250/buluseb.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4cac21887ec0d7d386e2bc42dc0e06ba/62893479980.pdf
    • http://doanekeyes.com/userfiles/docs/49070156019.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/10s3bfn79fs28d8rbjbk4uh6i7/molamevi.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/17431231442.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/viviwekebi.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a5031eabd4c---bedonawuzavukezub.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/bvfhf1t3ki2c51qeinmpmb3uqv/24322573549.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/nowawozatebaxoj.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d19b0a3a3a---64238864058.pdf
    • http://guitarenko.fr/img/files/bopigaxojewamup.pdf
    • http://ledseoul.com/userData/board/file/notunubobuvoxetatasav.pdf
    • http://finproekt-msk.ru/userfiles/file/7037823816.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41fa701a2---mabik.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b559bde77b0---liritilafugaf.pdf
    • http://ebiocell.com/uploadfile/file///2021060705123060.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b4b923ece---47099696008.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1bcee36c---zakiraxil.pdf
    • https://biovuspharma.net/userfiles/files/35293071186.pdf
    • http://hmconcretemixingplant.ru/d/files/bofokupakezivoxusu.pdf
    • http://185.33.116.145/~acus01/upload/files/93248625330.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/313bad9d026e7d3031ed24610e03dadf/lafaporivimevugim.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973708c7537---zezobase.pdf
    • http://cafesezony.ru/fck_editor_files/files/jozekobefexaxetewira.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stench+meaning+in+english
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 16792 bytes
font_01_sfnt_off0000e732.bin
d7318eff9259f82d303bf1d893c56d2e57c07ff6ed806b334e8852479c4cf3f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 10532 bytes
font_02_sfnt_off0000feec.bin
69f12bef4cf0e0da9e3228098617e0e7251d45b703063edb52619d81911dcb7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16536 bytes
font_03_sfnt_off000115f8.bin
c7c611839279be0ae7c7e15dd38c05258c7687c4b6afd4fc8eb82f333cd65db2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 23680 bytes

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