Malicious PDF — malware analysis report

Static analysis result for SHA-256 e555905b99a14cc8…

MALICIOUS

PDF

97.0 KB Created: 2021-08-14 07:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7bc2697169815c05866dab3d7979e6ff SHA-1: 66d23a7ac861fd42cfbace74a0a921ab6a107090 SHA-256: e555905b99a14cc80423cd159d4e39f23b2f46888b988c07ea744a5bca9061b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm suggest a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ahcxdq.com/uploads/file/091952581218.pdf In PDF document text
    • https://edusfera.pl/upload/file/xosudolabevoti.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160956127d45fd---4515869833.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/23fce8f5e9ce3a25df04595b06643700/deraxezaliliditebirive.pdfIn PDF document text
    • http://climtech.com/files/files/1013894952.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/zarakidabutaxutafatoxe.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/88866187939.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/47913029568.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/niraxenizozugotimupiwegan.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc2326ee1b---70111228749.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02dd85051---99580886973.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/18258462830.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/rozixiwezaje.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/safajorozuzivukowegoj.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/julugotedoriviseg.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/gulevosabukefat.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/192d17b841d24b2ff8499d6bb4ce9fa6/93468446339.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105140534484380.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ea5a38d8f5316c44a46aa0c54d90b65e/340730026.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/719ccf3406eaf30a48da535ce01b512a/49790738084.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d9c81f02---kesupiponemavibat.pdfIn PDF document text
    • https://aneri12.eu/res/file/xefedesaf.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nuwabepanazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=qu%C3%ADmica+a+ci%C3%AAncia+central+pdf+download+completoPDF 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_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 20388 bytes
SHA-256: d2ed4c034d879256cca295863ee08a6cfe94726caf1627344034571a06246da3
font_02_sfnt_off000158d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D1 11080 bytes
SHA-256: 8aeea2bc9babbaec5c22f5ca5927b26d135bbd4b28c0916859c04ff353b4f5cc

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