Malicious PDF — malware analysis report

Static analysis result for SHA-256 550b50fa02622651…

MALICIOUS

PDF

87.9 KB Created: 2021-07-22 08:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96912e230c13afb1688593165344d168 SHA-1: dbc7e7a1b1323c00bb43824ac585e3528f0d3b37 SHA-256: 550b50fa026226515c2c0c3b8f8efad9d60a1d4093e7db3e100c8c2c9a99752d
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aunay-sous-auneau.fr/ckfinder/userfiles/files/vusiwinimelitefibiwelibut.pdf
    • http://amuseonline.com/absite/userfiles/file/modobufilodesofugisorom.pdf
    • https://equator-maritime.com/userfiles/file/xarobiwanofusezusovi.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ju4evmgknk5vujp080vjubu0mp/fejuxomakinog.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b355170667901089bfd33f983632ad61/vinuvaluke.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f02606c2dd1---49588569139.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3dd67da524fed06062d03253ce07b5dc/fetesixewu.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ea654c01bef3c10676f15fcc015a081a/24952690873.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/639917bccfc3c21c9ddce10caebc1e40/24556157174.pdf
    • http://tns-china.cn/editor_upload_image/file/72649064770.pdf
    • https://aakritidigitals.com/userfiles/files/posewemekefegizanon.pdf
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/46074510449.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/qq633efeknkogj6er2mb4pke36/pujedufurikobaga.pdf
    • http://dush-kz.ru/uploads/fck/file/lolibuwugosu.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/37202417099.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b6737e928ff36b3d9e3a77518468bb26/81382638956.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdebadb73f---fuzetapawar.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2b116e91---xovijepod.pdf
    • https://alshamiltrading.com/alshamilfiles/file/zalipaviliwatugiwen.pdf
    • http://dkyangmei.com/uploadfile/file/2021070610035673499.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c417f8ea5b3---rejasewetonoponin.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/iu8u80qrvrt5jj35tdjt2pqo58/nitijudipuvavagivu.pdf
    • http://sxhk365.com/uploads/file///vebizane.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/paxit.pdf
    • http://fsgzb.com/upfolder/e/files/20210720144423.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dribble+up+customer+service
    • 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_off0000f45a.bin
18d7460b0edef971ed15a939e400485cb1f61bef859e295304cc9fdf4266def5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 10576 bytes
font_01_sfnt_off00010c5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 16792 bytes
font_02_sfnt_off0001246c.bin
370b3a691e715ead9a2a651e3ef5879219543db12928254b0d3ed5eceff58308
pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 17284 bytes