Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bde4ff88617b40…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 23:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f763e00818de6828c769e56345a27ce6 SHA-1: 1d8b8f8978f8c897445935e47c45b357d485e6ad SHA-256: 68bde4ff88617b4055c1d588720e2f41fd4f142236a70bb13a2cf807466dd9c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The presence of embedded JavaScript, flagged by heuristics, suggests potential for malicious actions like redirection or further payload delivery. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/9durqljkdmad2nm9a45um0oia7/10983011256.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5ac47316396d259545b8818b4eb397c3/lovijufanesuwoge.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/jabidisagowa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c97fe8f3a---jadapojotusoxobuxubileti.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/xevideluxisaxiri.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/remivoluraladikasoto.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/94364397936.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6a4t79rkl6e0pmms78hius33bd/41718767828.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/6ad923b9920b77c432f3520ff133a095/29803850208.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7b6a6e53---kinurulawenejutavulozewil.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/f6b2ga7ptd0qsotn2pl5o7grdk/wapenut.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6843dbd8f79aed30c5c88bdc7128c855/nofibugejafezidotiwifam.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/70367706783.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be4b460c6---poxevobofot.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/32433090047.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077f7772e065---wizomugilofa.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c902823ac19---vulupisajexedojimaxemav.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e9e5645ca---36080083275.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/oj4ojtt9ocjp8d74bbavkfa2kh/lofogixifelolazuzekone.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/rekamumegogusosetufas.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51ae29200---56630748351.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/54748969862.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/vexigefugikap.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1335d607976df8d596589026d1b4963a/japud.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/f2ds6lq6rmc1hm2lmuunei0ehi/loteluve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wow+mastery+food+shadowlandsPDF 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_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 10720 bytes
SHA-256: 28bd411f87a86d6aeb118517fa72584c36fe4ade94a5eb86d334b6207cbff997
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 18620 bytes
SHA-256: 6fe712316cb59b38eb5304fb3e66ce52be7b623051f9b4d384e4dc1753828864
font_02_sfnt_off00013282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1