PDF malware analysis — malicious · 3ecc74b030621d72

MALICIOUS

PDF

82.5 KB Created: 2021-07-07 16:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: a4dd55c8a1344732bb66eb29698ffe20 SHA-1: 9b2452271fec799ad37dd85610812ed7e3fdea59 SHA-256: 3ecc74b030621d72e57fb1b5a1d98cb88fe355546111df5c45cf13eef35bd460

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kn1clp4mk747g6joltsk07uhi7/wuroxuxapizepiz.pdf In PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/42f5dc709066f1963d0624a782e25827/narupamilininuli.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/812ee529c8e91aebe8264d9eff5fc52b/79191044191.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1db423269---11883461174.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf3a87407---56551534859.pdfIn PDF document text
- http://a1-recruitment.fr/v2011/Files/fck_upload/file/63069368054.pdfIn PDF document text
- http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909405308fc---71630843231.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/823507d00a899baf7afe85a443a26f35/93541955389.pdfIn PDF document text
- https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3ea6008b8578669aedde7aa720299a0e/21506100068.pdfIn PDF document text
- http://studiosimonepantaleo.it/userfiles/files/35951241499.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b633c825b82---sapakefuwulowa.pdfIn PDF document text
- http://feldbach-tourismus.at/files/zajexusumojebipepavu.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4d9967e5---kebirofilavelebume.pdfIn PDF document text
- http://elite-nails.pl/Upload/file/bulefo.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/p198dpp1alfge0c5ebhrh1loj3/24776345027.pdfIn PDF document text
- http://gyobel.it/public/file/30970698672.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d5ec9413---83892156039.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c20050bc687---makubapomunotif.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a791da2e5d---wepefapas.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8cf4b67fd---wulaginawukexujumalawif.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e41239b4---38843646405.pdfIn PDF document text
- http://mariopresto.pl/userfiles/file/78353540011.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/af02791a296083b0ba8a9879b7761d97/97254380899.pdfIn PDF document text
- https://wita.lt/images/files/78798950306.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e82153fa---28826364669.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4ddcd6c55---vudagirivowamanavi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=flexors+of+the+wrist+and+handPDF 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_off0000e0f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0F5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f907.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF907	16672 bytes
SHA-256: `50060b8d31bbce12ce42d76c49673d561417596b6c31aab436b70b66e0649019`
`font_02_sfnt_off00012476.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12476	10616 bytes
SHA-256: `67198efbde83ce776a635f84f802a8ab908040e4d4d55b74e548955e51fbf342`

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