Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aad8ac1fbf12ccc…

MALICIOUS

PDF

87.5 KB Created: 2021-07-08 07:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 400ef09ea66979fca9385e100c067051 SHA-1: 913fa6b16be6cab68d4d5f78aca8922cb57e0ed6 SHA-256: 1aad8ac1fbf12cccee4975ce01002e5ca7ff8d085d5388b417627c6c0f089fb5
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to download a second-stage payload. No scripts were extracted, but the presence of multiple external URIs and the overall heuristic profile points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5801fc02---31373465622.pdf In PDF document text
    • http://blankheich.de/images/uploads/file/vubifiloniwuliz.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xedivotifafi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f5962c0b4287a8b1d6bcd4f328bdd3e/98361891498.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/n11i0kfv5d9r76d07pqshik0tv/35886300582.pdfIn PDF document text
    • https://atl-50.com/files/file/52379925630.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/mosekozij.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35641db463---xozadevufog.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/74894394262.pdfIn PDF document text
    • https://securitydm.com/slicice/file/51127738695.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16207341420764.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4o3vcqk85nrsc47s6gqe1ar87j/patokanad.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/59140226979.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7c8be7ff5---firadejodebitebesawenajut.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0f0c85939---mopemavivuzakepebarov.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/22220097025.pdfPDF link annotation
    • http://seksdagen.nl/userfiles/file/fonerojudo.pdfIn PDF document text
    • http://greenbrier101.com/userimages/vunezavezi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61a1616975---7371675877.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7122d27371fe2fc663456db0d9cf352a/49406418205.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/r78fod4fm31ieo2po7oi3ssbvp/39719348874.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/81j81k2rkadrmsr3lb9vogukg9/joxarum.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904160bbe7c---52366840218.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56a4b26dc---67045342762.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910ef152114---78504984188.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/vewasumebofodebup.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d1be16d797ee01456fb658f3ed73d8ba/jajemope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=current+mood+meaningPDF 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_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 10508 bytes
SHA-256: c87f841f924e3e1f93c2c8ff15e673372bd94dc41b66d87e8c8ed72a7db27299
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 17956 bytes
SHA-256: e718a664c863dac05ec0023deb9b3a0d4d29b46cea4ad0e63d08be6af306cb79

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