Malicious PDF — malware analysis report

Static analysis result for SHA-256 727ea953863d25b9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 11:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 59d33d74cd881d9cd560516e61162e29 SHA-1: 595363450d2c7e79bb1ee336e542b3f9c0e806eb SHA-256: 727ea953863d25b93a6970a33e197afe3607fe91c95237ca79b51916bae6f5e5
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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
  • 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.
  • 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://crewmak.ru/uplcv?utm_term=certified+ethical+hacker+lab+manual+pdf PDF link annotation
    • http://cafemsoffice.com/userfiles/files/furedaxifidubuto.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d678568dea---kavewisibuvelo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ccc31f10aa66ac1d123c0cfa7c102aaa/85115289281.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/95424490823.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/5999944023.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/58428842188.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/gowomevepulimunotef.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/0l74envdkjd5i2r41buhkaudi6/82977553469.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/s7u8tgki1i7huvuidclvmtgfmn/91325548545.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8e949be76---94875530509.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/bodajolizurot.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/45177346076.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wogabewanovigowadimitolis.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/gomatobebadazaxepaz.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/174a1gg780gv7dc50qar4hj501/68488830457.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf00310b6f---mimifaxafivudoloj.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/79374998069.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/93554298ee79be536e336deeb3e1846c/sadexufafeg.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/31d12fd4823aa86cd0c4dbe26ded02c1/zinewumogonogofokel.pdfIn PDF document text
    • http://alvitraders.com/files/sezibiwotisezerifapinimok.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/57309586762.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/nutukos.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160711c3f97943---tosupojemulipozafipobofe.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/pegerufomokorelijavutowew.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/57916184a3b15a7d3b044c032c4fc02d/mogavabozubida.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/fuwixiponoduresura.pdfIn PDF document text
    • 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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 18044 bytes
SHA-256: b7377ff1796d6ee8d1922518a194b12fcefa1b6bfc38e5e165adfea195e8eb38
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 10960 bytes
SHA-256: a9ab44bfffdf792637966f2335d2380e454e2131611345c8988d6f4b8e289da8

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