PDF malware analysis — malicious · fa791446fb12c303

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 02:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: a98c946485304fd18c7912a20ebd2914 SHA-1: 90b0f7621fe7aac8022c37874413716e480cec26 SHA-256: fa791446fb12c30363a44d452037b06e94dc718ae384215811a07198d93a5a70

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a phishing or malware distribution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
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=jazz+licks+piano+pdf PDF link annotation
- http://topup-fight.com/ckfinder/userfiles/files/tonuli.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1653b79c518b54edd35b6162f5a12573/35281144060.pdfIn PDF document text
- https://x-software.cz/data/file/61822903466.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce865a8e9b---lurebuburezapire.pdfIn PDF document text
- http://deaprogettazioni.it/userfiles/files/66838257442.pdfIn PDF document text
- http://dworbieland.pl/userfiles/file/butenu.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc00c96fd3---16169985139.pdfIn PDF document text
- https://yukkumpulgroup1.com/contents/files/kopuluzepurepewusuwagexa.pdfIn PDF document text
- https://smobiil.eu/userfiles/files/70931655490.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5411300666e6b21193ad581c39ea22ab/48317637766.pdfIn PDF document text
- https://pixel.bg/img/file/sunetujov.pdfIn PDF document text
- http://personnelstrategies.net/userfiles/file/42568826602.pdfIn PDF document text
- https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/cqori43a7hji9oi3nr171lnv3m/fogokigag.pdfIn PDF document text
- http://sm.ac.th/ckfinder/userfiles/files/pewezibav.pdfIn PDF document text
- https://drrajanmahtani.com/userfiles/files/xuzugupe.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a439d4d0a24---67067321241.pdfIn PDF document text
- https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e5386ec275d60fdaf4b15d99501b633f/sebojiba.pdfIn PDF document text
- http://ltptech.vn/uploads/userfiles/file/neliboxajixebuliju.pdfIn PDF document text
- https://peterdegendt.be/file/gerisisoxisevekefeve.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qgun82u58pojk3pvgnvaktntf0/84382537039.pdfIn PDF document text
- http://apvn.info/userfiles/file/19256126723.pdfIn PDF document text
- http://oris-am.com/editor_up/51345623125.pdfIn PDF document text
- http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/16649653982.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3e95fb22d8d564d5e85669e5d06eb139/19037881206.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_off0000d9a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9A0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f1b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1B7	10424 bytes
SHA-256: `9ddd802cb06c50d5f0413c6395564af779ac061ff28c88b7c55202b596f899a9`
`font_02_sfnt_off0001097b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1097B	17772 bytes
SHA-256: `a673951bbca677919c4de9cf49719647a3b95d840d0fee3c5c69fe1f67974f72`

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