Malicious PDF — malware analysis report

Static analysis result for SHA-256 0726e55baa3459d4…

MALICIOUS

PDF

90.8 KB Created: 2021-08-01 20:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2c6c5125d84291013a4932ad88ec4b7e SHA-1: b45e04d0fbd197b52ac28911da414e31975f35f1 SHA-256: 0726e55baa3459d4d3093fc592e7772516af33c43616fe48547591c08be111b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/9ivo6087l77mtllvvahmcb1170/vuzususigilamere.pdf In PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/1892574277.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/werexoboxejulevuj.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/84205318771.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/nupogig.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/welejepudurokemeladized.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa299077fb---vovafaxovexixo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160942c0f49e29---rogut.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/53173038554.pdfIn PDF document text
    • http://alkanboya.com/files/file///nojakolumawetofedatik.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2dc15122---57181763181.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/92980582463.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/91562054790.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6720596f8f64a3a40ebf082d19a19628/fomimazikeson.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084f78740775---xovoleruxowokirunuwinul.pdfIn PDF document text
    • http://centronegozi.com/public/wikudasakeseraloluw.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/nuroretamidizozawojovin.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xonozekinaputinirumoki.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b23412166b9f026ae3785797724da491/89054846055.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/308b37c891c0026464af56d3aa2f2eee/26309948900.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608152cd2733a---44865363025.pdfIn PDF document text
    • http://mayjack.com/upload/files/pawofibozop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+are+the+causes+of+urbanisation+in+south+africaPDF 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_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 10620 bytes
SHA-256: 405d38f80bbca8572024a5f124f20f461aecd26e9e28f8de282e9003a2bd6187
font_01_sfnt_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 17896 bytes
SHA-256: adbde1ab730811fe51621193c52d809db1a6a90c93ac58ad35d240fff01ca80e
font_02_sfnt_off0001438d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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