Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fc545734c37f3d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 14:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ac3fb11d5d0da50fe3b7992c49f43e6 SHA-1: 825aefb6d3625fb20ec8074e22d11cfd990a4190 SHA-256: b2fc545734c37f3dbdbc2514f5dda20ded6dd05da554bbe51690da48155e4e3a
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, some pointing to compromised CMS uploads, indicating an attempt to host and distribute malicious content. The presence of a visual download button further supports a lure-based attack pattern. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of vulnerabilities or the delivery of further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=never+not+love+you+full+movie+watch+online+with+english+subtitles
    • https://dabanbep.tanglehadong.com/upload/files/zuvifatuboparojeregemi.pdf
    • https://www.campacinter.com/image/upload/File/kavekofoj.pdf
    • http://caythuocnam.org/images/files/92335565902.pdf
    • http://artediapharma.com/upload/files/60194631440.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/84162222664.pdf
    • http://dichvugiayphep.biz/upload/ck/files/24212055569.pdf
    • http://crestviewshopping.abwingsmd.com/uploads/files/xenapegojefarobasim.pdf
    • http://majstrissmt.eu/www-data/file/tifewajesobowame.pdf
    • https://webmenuplus.com/images/file/begexowamolutaxojixo.pdf
    • http://stroi-sistema.ru/img/6382454187.pdf
    • https://camphacement.vn/upload/files/namogasam.pdf
    • http://netmode.net/app/webroot/uploads/files/54312562989.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb3184382---67567674414.pdf
    • http://arndt-fahrschule.de/userfiles/file/xebilofubesexukovu.pdf
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/xofisirojuvinepovitegef.pdf
    • https://simpangkanan.com/contents/files/bimatudapuxufopukuninu.pdf
    • http://shangyi-pump.com/uploads/file/051947121326.pdf
    • http://webspace.mysdam.net/images/newsletter/files/vevewezuwopiwakilevifulut.pdf
    • http://salman-group.com/userfiles/file/95564429.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/bb3566cad64ea54e609ea75a8e3ea789/jewuzon.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fa76bf62---sififufofoguwi.pdf
    • https://myreply.mobi/snappshott/editor//file/77574217085.pdf
    • http://kedehg.com/ckfinder/userfiles/files/pubem.pdf
    • http://garagehayashi.com/js/upload/files/nafizekakogujuf.pdf
    • 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_off0000dad9.bin
4bd554243d1b7b60265a5243b0087b87156b722b8aba247e40338812b2addab5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 17916 bytes
font_01_sfnt_off0001097b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 16792 bytes
font_02_sfnt_off00012192.bin
c445f3cfd6d34485d0f7ddda9971dac94baa2be0a35a6f26c46b8ff66e8746c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 11268 bytes