PDF malware analysis — malicious · f99b1699928ff0bd

MALICIOUS

PDF

81.5 KB Created: 2021-07-31 13:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 1a9f75f019a7895d9a326cce4a1052d4 SHA-1: 87396152d97215004d336106fbb51f258a3e6396 SHA-256: f99b1699928ff0bdd57c6e99961432029ac3ee2376713da7b06df48a400b8438

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous external URIs, including those on compromised CMS uploads, strongly suggests a phishing or malicious redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/12443404258.pdf In PDF document text
- http://reutlinger.pl/userfiles/file/galuluvibiniw.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8369ff006b519d688feb167a50f1ec1e/73984486166.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4be81433c82d22f11323a100971befb3/duruzuregurujilevugator.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/mg22g4i9gh20u0fjempjapn8to/dugaxonaluxivosezaz.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160878bfb92b01---musogilokux.pdfIn PDF document text
- http://nature-revive.org/files/file/60732259303.pdfIn PDF document text
- http://k-souz.com/userfiles/file/2841839313.pdfIn PDF document text
- http://akinmedikal.com/uploads/file/dasezufepokozamunekumal.pdfIn PDF document text
- http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xozumesukezo.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb946cb4d0---gabapetozesuradu.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c71ff49e66---rorewomukosalinev.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ab53605ff---5572769611.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c8ec8ee8999c4a1deca9017df7e13df0/bowunenasavazobejeroruvi.pdfIn PDF document text
- http://ahcxdq.com/uploads/file/13040945998.pdfIn PDF document text
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/634d9f4645e4e2c587c7204c2668a94b/tafinesiwananero.pdfIn PDF document text
- http://ladyqueen.it/userfiles/files/noxixedi.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085f470553f9---zifoz.pdfIn PDF document text
- http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/toboriradujonedivegokuw.pdfIn PDF document text
- https://pasarantogeldua.com/contents//files/sebugatinuneroleti.pdfIn PDF document text
- http://gtshotel.it/images/file/92893847020.pdfIn PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0gqjhht0bm07ujgckil9799gi/netapomivaxumiba.pdfIn PDF document text
- https://dutchfansitenetwork.nl/ckfinder/userfiles/files/76273157828.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917632a4c39---25393232022.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4e85216796261f4f768800728fb159da/raxaluzipuvugobel.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a50557d4b14---zakirabakujenezumix.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=geometry+congruent+segments+worksheet+4.3PDF 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_off0000d9ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9BA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f1d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1D1	11124 bytes
SHA-256: `45d1e3453e05d189cf3e24765a9055bc9ed465809e214507dcf95b25c7cee81a`
`font_02_sfnt_off00010bda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BDA	15992 bytes
SHA-256: `996210be18136f7dbbc9dc357d61c9475931af67ff6bbb747c7d00fbfa1cb404`

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