Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e23f794760be4d2…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 17:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec3c1c687b57db8defc666bbba1e0d8a SHA-1: 43858c4fb14988370b5a27250ad2f8d11314e653 SHA-256: 3e23f794760be4d2a4ae631c8356b5060b10af8a9fecc5f8428b1b516dc6f928
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d19d5297d0---maxosojiwozuzaxokoludus.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/24652672372.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/wixuzuvuw.pdf
    • https://www.ruchya.com.tw/upload/files/xusutemizajorukik.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210506233049_534117701.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608542342541d---sojilegaxapixagur.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/vr4glasiva1k5cn7urvo35tmmu/23313547261.pdf
    • http://eko-inwest.eu/upload/file/wuwamowevaniboxalale.pdf
    • http://brezov-gaj.si/uporabnik/file/87110029635.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/jowonaziwov.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/tazanes.pdf
    • http://vickerycarpet.com/uploads/images//files/84136442127.pdf
    • https://lawrenceyezersky.com/userfiles/file/52071404198.pdf
    • http://zimmerei-possert.at/30935755357.pdf
    • https://enerjimakine.com/tsrm1/img/userfiles/file/wikiwanowebupogarotozodav.pdf
    • https://nguyenhungstone.com/uploads/image/files/98324209576.pdf
    • https://krossi.ru/images/content/files/17644638077.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5gtcn559536a7ug3puh8fccr67/89156836388.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/eaf5ecc0f45134d9319c31ee40c259a3/50018532800.pdf
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/vadetapegixi.pdf
    • http://codefon.hu/js/ckfinder/userfiles/files/97811741311.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160940386cc337---93321610160.pdf
    • http://tuning-zone.eu/userfiles/file/83930111257.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8217047be540429e9876e4a898ac2974/49994947762.pdf
    • https://v-rshine.com/upload/images/files/50451855041.pdf
    • http://lideparts.com/userfiles/file/1621593403.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bsc+agriculture+syllabus+pdf+2017
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A2 16792 bytes
font_01_sfnt_off0000ddb4.bin
1a449aac04a8c60bb3eae9a5609dbcc0cf16aa06f753464c198aa0b92c2d3e46
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 16960 bytes
font_02_sfnt_off000109fb.bin
556697a8540cab2d84f51fb29b1307f2e62ca02a34d3777ab2d46c7863213774
pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 11324 bytes