PDF malware analysis — malicious · d3928921d42e4637

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 06:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: f39f49d749eed2305f7f46e405e1bebf SHA-1: dc720fd00f2521873f2502a0bbc976c478dd9613 SHA-256: d3928921d42e4637db77e1b231caee8585186a0d433eebb879beed5aaa6e492c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into phishing or malware downloads. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially track user interactions.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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.
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 https://oniceh.ru/uplcv?utm_term=aortic+valve+with+2+leaflets PDF link annotation
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/igscqnek0ff9jd5vsp8hi7epd6/21475503067.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ef4258430e5fe1e9218be42e257405d6/29586827695.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160d7697ba4cac---7739938512.pdfIn PDF document text
- http://asbufestival.com/uploads/FCK_files/file/1342648443.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c52ba1858f4---siliruxuvanid.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0a9681894fdb5d9f5aede9eb9fa902e3/4134511394.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083e8b8e0bd9---77266080577.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098749fabea4---9192940030.pdfIn PDF document text
- http://accomplishtheimpossible.com/userfiles_ati/file/kuminowurasedanuxevuz.pdfIn PDF document text
- https://bhsbeacon.com/FCKeditor/file/60489971081.pdfIn PDF document text
- http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608570b87f04b---68671112331.pdfIn PDF document text
- https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a43dd0ed---87477041411.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdba49a72a2---subuxoxa.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3e8215fcbcbb23d021a63f48b7ab0e78/78714016817.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b010a96bc---rigosisenosudoredan.pdfIn PDF document text
- https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7il3v3tphjqavth44hnmqk62nh/38673866014.pdfIn PDF document text
- https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b03de34d---mimiwuniterudubaxejaz.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a8405f60d152df64df3e79c5bd27105f/tesupisid.pdfIn PDF document text
- http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f4d9d193---belozopokip.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160718c8eb1a67---wodisajekemedodafimalu.pdfIn PDF document text
- https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/200b4bac0315f861604d361dbc9dfe5b/35146680323.pdfIn PDF document text
- https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bhva0os7l2quotu4h8flf5th3/90579480437.pdfIn PDF document text
- https://abofahed.com/userfiles/file/gegemidudug.pdfIn PDF document text
- http://changju-hotel.com/CKEdit/upload/files/kaxuruv.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/mme070k2e06h96su9e64l5ugk1/23930027323.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfd10b091---meberesodemajage.pdfIn PDF document text
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f20b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF20B	10580 bytes
SHA-256: `3d48ed0c78d0a3172e2f3df3f71d45ea51b8888df537560f5c77535ff4cf391f`
`font_01_sfnt_off00010a80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A80	16316 bytes
SHA-256: `16347ec21cfbb80b04d6ff70b84548ae292f8a942d9ab4b089652d136e5189f6`
`font_02_sfnt_off000134c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134C8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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