PDF malware analysis — malicious · ee697b12f20e4032

MALICIOUS

PDF

86.8 KB Created: 2021-07-31 21:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 5ac557a0c8fc6e7003951be3ceaf7750 SHA-1: 52cb8bbc8cd2210942fc46b8f894df1d29304602 SHA-256: ee697b12f20e403293656a8473a222b16d427a6b3c1fe3e11edbbd9a05a54296

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://crewmak.ru/uplcv?utm_term=how+old+is+benedetta+caretta PDF link annotation
- http://studiodabo.eu/userfiles/files/mefos.pdfIn PDF document text
- http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/dovatutasixenap.pdfIn PDF document text
- http://csc0535.com/userfiles/file/20210625061440_yfm6mu.pdfIn PDF document text
- http://annandale1963.com/clients/69704/File/88559748336.pdfIn PDF document text
- https://tecnicadovolante.com/images/file/64787487935.pdfIn PDF document text
- https://sealand-pptc.com/userfiles/file/21707252065.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ilbdm2tvgk94th7hpirstgga35/kobekoxusasiwup.pdfIn PDF document text
- http://carscaso.com/js/upload/files/xusorasibokawatamafofan.pdfIn PDF document text
- https://barcelonacentremedic.cat/files/galeria/files/32145823476.pdfIn PDF document text
- http://atenngo.com/admin/sites/site/documents/nojukelaguzutubeb.pdfIn PDF document text
- https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1d097d55f99e0f28892e39ba24c40353/24649040016.pdfIn PDF document text
- http://humanlitech.com/files/files/24638173195.pdfIn PDF document text
- https://tavcam.com/upload/ckfinder/files/kotejomizaxuwatowa.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86032d570d---87226449265.pdfIn PDF document text
- http://richwoods1969.com/clients/861079/File/weturuguparanupi.pdfIn PDF document text
- http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/6869798572.pdfIn PDF document text
- http://9meclinic.com/ckfinder/userfiles/files/59016872660.pdfIn PDF document text
- https://amitadevnani.com/userfiles/file/woxafofovavilosepeten.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99e305acc9---sawunodutobovuxenizedatuz.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2ugbuhsgj98jpg6tgiq8a09ftc/kajaketawigimorez.pdfIn PDF document text
- https://drivetripper.com/userfiles2020/files/18349763452.pdfIn PDF document text
- https://eminencesolutions.in/resources/userfiles/file/dotasifo.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7kb9u2950v8sdq49n7iknjvrk0/45250235791.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_off0000ee04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE04	10580 bytes
SHA-256: `96f6f0915a03a6dcb691f857b91b91185a69fdbb2ab778804856ea4032bbbf4f`
`font_01_sfnt_off00010643.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10643	18056 bytes
SHA-256: `7f0f5469027801494ef76ea725e4d86c227f996ca8c7edc9ac5debc216a2273f`
`font_02_sfnt_off0001350b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1350B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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