Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d5b82b398dc5c8…

MALICIOUS

PDF

81.8 KB Created: 2021-08-15 13:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0f00763089be79e790aa413a39035b6 SHA-1: d3fb695e6ef8a240974ea6a20d6f0c74a7bae7bd SHA-256: 87d5b82b398dc5c81a1d946438f9b7758031a43e202aaa8c4e8a68e4698f6c07
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress sites or IP addresses, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca137812e94---31239270004.pdf In PDF document text
    • https://allcreaturesinc.com/files/files/rakikaw.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/rusoluguxerazutarasilo.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/18572809233.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/66913157940.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/lerexe.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a838ccaf77e---35402972037.pdfPDF link annotation
    • https://searchlink.org/userfiles//file/deluv.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/jamememet.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/132737089.pdfIn PDF document text
    • http://szhlfz.net/upload/kapokojakiwu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee6a0ddee---fesepubixut.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/xuvoki.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuzogokawadimomojovipege.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/98358253997.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a380b9d1ca0---9587117821.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9b964f36---98744462616.pdfIn PDF document text
    • http://freeski.hu/freeski/file/tejikesotujedubazelefuk.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/vekilebama.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/43819165511.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881a130514c---zebiteneputenokob.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/niwab.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fb664751a---tovibazelofodetobiligadut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=naruto+ultimate+ninja+impact+mod+storm+4+road+to+borutoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC359 17140 bytes
SHA-256: ecc2aa1ed62057f3be5e34bb7dffa944ceb5bf4a5a57cceb01d682ca68e59609
font_01_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 11100 bytes
SHA-256: a12e920ac40bebe65fdb1e6d0e2882d6102eb761ee1a8a250aeca31597c1d9ca
font_02_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 16348 bytes
SHA-256: 51c964afac6754e15219d4ee140c3d6f6482fbd6b6c6456c3c82d222f54df4e6
font_03_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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