Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7b22c926bb059d…

MALICIOUS

PDF

106.1 KB Created: 2021-09-06 05:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fba37a8cdf78bb2e2409795827ca6886 SHA-1: 957b3650aa5485d65088061383af9c7487f6f5a7 SHA-256: 4a7b22c926bb059dad6fade172d50a3850b5765942ba7fd2bec36d6b10b945e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799d865fee6---ruboramezujevivo.pdf In PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/69994879464.pdfIn PDF document text
    • http://apismorava.eu/docs/vimozowoboxamugepoloseje.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/90955970831.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/43825369743.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/watodofoxegidigewiku.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/75356467289.pdfIn PDF document text
    • https://botroul.be/uploads/gidiraxu.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/39405756609.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a982c31537c---71115274776.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/8024723508.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0e7f290a0---wuxofezatobefezanetafa.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7464b4206---98697386948.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/1d6021fcf6ecc5f20c06d46f292affdd/7282894541.pdfIn PDF document text
    • http://ipllaser.in/uploads/pegari.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/xejawujixe.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/fupivarujeko.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d751109ad8---raguteliwejapojun.pdfIn PDF document text
    • http://kotolantopeni.cz/file/20814053776.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d8390335b1bb30debc1b95eab54bb5ca/69855189919.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/zivekexiboduxoju.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/fb257b55894fb9efea83e07c26a4e27e/46468434464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=triangle+cards+for+congruent+triangles+worksheet+a+answersPDF 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_off00013284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 10996 bytes
SHA-256: 2b6e44393ec2860f3a4ee53b1a002fe496924bdcc1e85577948f951ca0a929e9
font_01_sfnt_off00014bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDC 20848 bytes
SHA-256: a3f2695ed85cc89ac21c135a08253d2df3751281eb40672995b0b8c536d255d6
font_02_sfnt_off00018243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1