Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c2438d3ee4ba00…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 21:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a2c2f5519ea634a19c173626c7998e7d SHA-1: 4660bdccaac31b264f961ea4a7d7c0ff26bbf866 SHA-256: f1c2438d3ee4ba0031ce27f85578937536e6d5de3821717e59538b084ca6034e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. It also contains numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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://sanagustin.cl/files/xiligokiburep.pdf In PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/tukugosigexopubinadomaxej.pdfIn PDF document text
    • https://harom.ro/files/file/wamejunavule.pdfIn PDF document text
    • http://scarpatti.com/files/poruzunemotuwot.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161354ac080f8a---vebekasisarokidutovibevo.pdfIn PDF document text
    • http://chpcentre.com/files/file/guvesupadodinebus.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/rarekafedikimevakorisina.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/dejovazinikasow.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/87153135439.pdfIn PDF document text
    • https://webmenuplus.com/images/file/kuwopokazixuxis.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/janemawu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/90513be467a8cbcfcef3919a91268a69/15207945313.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/63341671233.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/javel.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b57c653da7---jesasedikokoxuse.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/51198021256.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613267029aee9---rakukufutiv.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091416511143.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/86020545353.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/32692332645.pdfIn PDF document text
    • http://bienbao.net/uploads/files/79902260423.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/67911809046.pdfIn PDF document text
    • https://ijp2.com/contents/files/17891003354.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/22533839420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+sites+for+download+web+seriesPDF 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_off0000b0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C8 14532 bytes
SHA-256: ff12941216e9cef64a2e6ee2f9e324112d9d67e6da5e75f1ccf079af00505aab
font_02_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 10628 bytes
SHA-256: 9089be1a31fce50ee78d974e4981b3e699d82dc14914faebea1c00eff7f1245b

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