Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34b30697f2f5e5d…

MALICIOUS

PDF

88.5 KB Created: 2021-07-30 08:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef348190e4ca89b006343b49f32206ef SHA-1: b73633a2d5b7525123e9b39bb9a17fdd3fe47f1a SHA-256: e34b30697f2f5e5da41aa02539abd7a68b71613ca172bc76fab68ff526968d25
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm with multiple external URIs, several of which point to compromised WordPress upload directories, indicating a potential distribution point for malicious content or phishing lures. The presence of a download button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nnkcreations.com/userfiles/file/20278418636.pdf In PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46c1356de4---rebemukaxoj.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107061150018390.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/43031428325.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e3cd1c3ef49bafa8dec17bedccff811b/48487432970.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/15033ccd806958288ce63427aae79350/46080073418.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fd216bb03e1---busevezadutezafumolovipu.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/tokipigetolipipasisosu.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/parorowebobutabir.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/498f34483fbb4b86bc492a02b0928fbb/51747160118.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2377b89cf9---26855292519.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/90346768823.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc0a6ea2ca---21835417463.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e3fc09c8af3a5982f3ba545c03503818/wodegefumapalelezot.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/gugazadiraguxof.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/28222722094.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/bagutuvo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16075b159a95df---7926729352.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9d1n0te4nvk6vk0tnb4f317b63/kiwutabijufazivodukifefaz.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvaf.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/xalazu.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/mesobiwozikojasi.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/tilija.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161024824b5cb3---guguxujod.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/vularetofexez.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c47dd4d3a---ruvetowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=transformers+1+tamil+dubbed+movie+free+download+in+tamilrockersPDF 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_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 11136 bytes
SHA-256: dbab8332e4d83e4f64bf7bcba3275fa8dd98bd45a7a9db9296864a4614785906
font_02_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 17108 bytes
SHA-256: 3a70ba6e5dc16d8807e7676848bcb26e2c049750157efefd677b87463d1490b6

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