Malicious PDF — malware analysis report

Static analysis result for SHA-256 5330856a1ea54eb1…

MALICIOUS

PDF

90.8 KB Created: 2021-07-26 02:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d0beb944abd8823d36b1808a8f54e01 SHA-1: d53c2a8dd5f2ffa68cea73366f2d1d5925434455 SHA-256: 5330856a1ea54eb18d9e37c98bb3d6877bb5617af9fd494bbdcf271e67530447
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting it's designed to deliver a second-stage payload. The embedded JavaScript likely facilitates the execution of malicious code or the download of further malware, aligning with the 'Exploitation for Client Execution' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ov1l6ivp1u7fbu81h46u6vohmj/47627962529.pdf In PDF document text
    • https://dla-pracownika.pl/pliki_user/File/tejirijiwedafidurowu.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/763628d4852ed2ddac58a23ca6b6eb5d/5295428398.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9f8505c72ef7239e5917f491cff86f88/detaga.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160831779ccdd3---xejuvuviwo.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/78729631599.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/libezagujej.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/28293485234.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/vep9rhb0ojge19ksi0p9392o6esakquv/saxeliroborax.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/1e54a1c714f0a4de407ff869df8bb6d7/dibojelivotexed.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0ba3b7a96200469844095165add49fed/pakagojizegofe.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/abf89586a08331b35eb02cb262a28b0a/fofowevi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uhqa3bkf2gtj94mufb8br9uk3u/nusosevuvozasug.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f03050af381---69492542407.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/toxapotisanozeruzum.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/48486619149.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/44b076989d69680cddcd3843998c2e0e/vonum.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/duzabigigunive.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/17t4tp88vofk7pailmggq1h71i/643501324.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/75261006913.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a47b046302fcfa3b8e1576ce2de80f11/3738581687.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/vuniveputudolox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=employee+background+verification+form+samplePDF 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_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11340 11456 bytes
SHA-256: 96dd4b34129804aaa4652bb5574a4e7f22ac8f528a4e49ab81b41074ce6fac9b
font_02_sfnt_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 17140 bytes
SHA-256: b89d6a4130f6e71673af244ad116fd7173b081dd015529fb56bf84165503d0e6

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