PDF malware analysis — malicious · 23e42b91fb07cfa6

MALICIOUS

PDF

77.7 KB Created: 2021-08-19 10:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 8a56970dba8e32ff12b3bcdacee03ff5 SHA-1: 3f300bf187b7595812d77a95e9945928570d7813 SHA-256: 23e42b91fb07cfa601361e53cba547f87b7d208cd0c9492843ee17be5e3926a8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

Heuristics 6

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.
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://omegaplus.bg/uploads/pages/files/beloluz.pdf In PDF document text
- http://timebank.ru/sites/default/files/photos/pagefile/dikopovugowezumeser.pdfIn PDF document text
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607837e4c964b---81981528901.pdfIn PDF document text
- https://777mto.org/contents//files/tigipoxamo.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a847701111e---8709530469.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80211044a---digasiweriwuzenabi.pdfIn PDF document text
- https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/a1ca11c0e96dceb8d087158692b49f22/patidanogafiji.pdfIn PDF document text
- http://getem.plfiles/file/25889023861.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/289fa6669b08b650cb94302b6cc851d4/didixajile.pdfIn PDF document text
- https://pasarant0g3l-turbo-h1t.com/contents//files/somijubibawupakupizasaju.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0e30cbb4094a4c47da1767df258954d4/ritusivituzixe.pdfIn PDF document text
- http://dulichtantai.com/files/uploaded/files/59206411182.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df8329c89a---sosofubuzasaruk.pdfIn PDF document text
- http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/nudaga.pdfIn PDF document text
- http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608840019123f---duvekigo.pdfIn PDF document text
- http://sharon-barron.com/userfiles/files/27988484681.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a2i6qb02ehlqdh4id8eri1k2rq/17174160555.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5b580da05aef973ea1bb5e2010175451/79760585370.pdfIn PDF document text
- http://xn--80aikni6a0b.xn--p1ai/images/file/lemesewidudovujuvinejo.pdfIn PDF document text
- https://kovosluzba-praha.cz/res/file/zogazipelafuvikomozoku.pdfIn PDF document text
- https://foodvellythailand.com/upload/files/96009958401.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e1d4c78fa29922776c1a44fd98c1b14e/89330041816.pdfIn PDF document text
- http://pnlestari.com/visitbali/image/files/defogatufoz.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111cfe7c189f---xefaxatonojenuga.pdfIn PDF document text
- http://aaaexpressheating.com/userfiles/file/tewubedenulofevifex.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=garage+door+opener+will+not+open+in+cold+weatherPDF 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_off0000c85a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC85A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e06c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE06C	18224 bytes
SHA-256: `d27561a684e82f0d0c3a5881f796aa314dc2690a8a372ffd67e47457d91f941d`
`font_02_sfnt_off00010ec6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EC6	10748 bytes
SHA-256: `d4b8dcf9290f1041624a0edb040d1636576897fc6b69b9c4866b854fae810db0`

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