PDF malware analysis — malicious · c0cb5ac8e38a5274

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 15:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e4d330026379b7c0c624e85b92316b05 SHA-1: 0356a218ac24f0a2ccdb8f451dc535b291ba99ab SHA-256: c0cb5ac8e38a52743d12fd5909d51c1bb4fe568256853b535148982f35b2cdeb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The file's structure and URL patterns are consistent with a phishing lure attempting to trick users into clicking through to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://phucuongplus.com/upload/files/bixibiwosasolafivilozul.pdf In PDF document text
- http://facilitymanagementassociates.com/survey/userfiles/files/49266005057.pdfIn PDF document text
- http://cuacuonnhanh.vn/Images_upload/files/tanotu.pdfIn PDF document text
- http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/pesuxafiwafaju.pdfIn PDF document text
- http://archinfo.ru/uploads/file/85106332365.pdfIn PDF document text
- https://vanvoorst.info/uploaded/file/birivekatapoxezifokedi.pdfIn PDF document text
- http://shreejians.com/userfiles/file/15075275582.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ec5b1eeff32fc9e9a5606dd77e8dc827/9823217917.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1a193642753e9ebdb92e6ca1c646a977/ratapuwo.pdfIn PDF document text
- http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/jisisiseronire.pdfIn PDF document text
- http://robalton.es/Albums/images/file///83052107920.pdfIn PDF document text
- https://etonbio.com/newsLetters/images/file/lelazedafumipuv.pdfIn PDF document text
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a567cb132466f7558686fda08a9b901d/75778866115.pdfIn PDF document text
- https://viessmannboilers.ca/fck_upload/file/nawaduriwaf.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/0dac90032f0fa05da07ca316976d9616/topunawuwugesude.pdfIn PDF document text
- http://tamker.hu/userfiles/file/85444983099.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cee89c384c151b1c72dc7050b52ecb35/73258984653.pdfIn PDF document text
- http://oticonshop.net/ckfinder/userfiles/files/40196461039.pdfIn PDF document text
- http://e-restauracion.com/app/webroot/files/uploads/files/ziratufokewemunajifubolis.pdfIn PDF document text
- https://radmangroup-ye.com/rgfiles/file/4826410821.pdfIn PDF document text
- http://notarbrazda.cz/userfiles/file/dejorotuxaredazasajipuk.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921294a4e85---tebipakiluwedebufame.pdfIn PDF document text
- https://ka-base.no/images_content/file/30772491467.pdfIn PDF document text
- http://csc0731.com/userfiles/file/20210721104136_nmwyi0.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nda+all+question+paper+pdf+downloadPDF link annotation
- 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_off0000d48f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD48F	10800 bytes
SHA-256: `0f1b77f5c5af7635fca2d79d2d7b1747473c7db33397e11b35b6c04b702510fb`
`font_01_sfnt_off0000ed61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED61	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010573.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10573	17260 bytes
SHA-256: `f1a26a90e439b0356536105bd1cef152f5fc8410f584c4108c1d5fa0f4784f6f`

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