Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bb4bb964aeba58…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 12:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ab146272595627a75748096deba5231 SHA-1: b0758d373352488d1261bb4e98c159d12061db53 SHA-256: f5bb4bb964aeba582782e14004ceafafe96580fd756b27511da0a0a4d793febc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the malicious intent of luring users to click on these links. ClamAV detection and ML classification strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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://chcial.ru/uplcv?utm_term=ldplayer+4+free+download
    • http://unicaconsultoriarh.com/images/files/79234204640.pdf
    • https://stillwaiting.org/userfiles/file/sumozosor.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef90b09309---pogofiwizenufixutabin.pdf
    • http://phayaotechno.com/UserFiles/File/13040444443.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613246bb3b13b---83801033336.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/wokosojegavago.pdf
    • https://locktactyuma.com/ckfinder/userfiles/files/85474439956.pdf
    • http://bookblog.kr/data/file/files/zupufos.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/5136723557.pdf
    • https://ratosatu.com/contents/files/fularofez.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131303411727---97466988590.pdf
    • https://marupyara.com/fotos/userfiles/file/35003219554.pdf
    • https://mimpidia2.com/contents/files/8392188708.pdf
    • http://robbes.nl/media/files/favulizanes.pdf
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/duloranumesizuj.pdf
    • http://teresachild.com/upload/files/53089772259.pdf
    • https://aradmissions.com/ci/userfiles/files/48677201285.pdf
    • http://dlevitin.ru/fck_editor_files/files/22854651254.pdf
    • http://yishiweb.com/upfiles/files/20210908_221127.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/vamazatu.pdf
    • http://hnspkjx.com/d/files/19426745476.pdf
    • http://obkladlazby.cz/userfiles/file/89127585120.pdf
    • http://lpsa.cz/userfiles/file/47939626610.pdf
    • http://trips-in.com/ckupload/files/388929546.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf5593ed49---rudirinubi.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/mavunepenekezika.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_off0000d6cb.bin
91091d15b24c7222f22cd74ae65e754128092152b8cb865ac0e3fdccdb3b475b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 10368 bytes
font_01_sfnt_off0000ee70.bin
9621319632b03fc1a77b26432ae677156df60a392dbc74c204462070be5c9232
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 18144 bytes
font_02_sfnt_off00011d71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 16792 bytes