PDF malware analysis — malicious · 70b7add838454a7c

MALICIOUS

PDF

136.3 KB Created: 2021-09-01 07:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 784c1f5ef5d8655b184f9efe78bd22b1 SHA-1: b346d22466a43632955e926520f2b6f36026d86c SHA-256: 70b7add838454a7ced3c59728c0f7b995cc62b4e576780222cc8aeffe50b4786

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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 https://crewmak.ru/uplcv?utm_term=300+f+to+celsius PDF link annotation
- http://ahkjt.com/upfile/file/3601673990.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad4f0f36f---posegoj.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e87a051b0---nufamadodem.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mk8r0jlls00uudnc6vkl3dmt49/vigepewegulasixuxo.pdfIn PDF document text
- http://djarkitek.com/temp/vinney/HTML/userfiles/file/62601575744.pdfIn PDF document text
- http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae85cb48f24---notazosewav.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee41d670a9d---33440323367.pdfIn PDF document text
- https://rcvizovice.cz/ckfinder/userfiles/files/90836793833.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cfd620e4b4e40b8d634b38bf995f2e6c/wajoxosigul.pdfIn PDF document text
- http://metabolit-plus.ru/files/file/11771330149.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071517ade1e3---3348710234.pdfIn PDF document text
- https://paklya.su/design/img/upload/file/98694051223.pdfIn PDF document text
- http://kochi-mimoto-iin.com/TakamatsuClinic/userfiles/file/91576142124.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161101e106d2fc---12598933171.pdfIn PDF document text
- http://universe-micro.com/upload/files/20210804_020900.pdfIn PDF document text
- https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/26bgdml0lqlrsf9d9pd8c593e0/kusum.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/gke9q04eg39d5ubek49uehf766/mumegaxazinajik.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1bc4787b9db288496a8d612452a604f1/rajogosa.pdfIn PDF document text
- http://avsa.org/sites/default/files/images/files/85667699182.pdfIn PDF document text
- http://stavclearing.ru/upload/files/xoxuvukanamugodiw.pdfIn PDF document text
- http://chaukitchen.com/uploads/files/21978366179.pdfIn PDF document text
- http://shukokai-voves.fr/userfiles/file/39341423274.pdfIn PDF document text
- http://galluccifaibano.it/userfiles/file/8740069950.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d75393e71---kosajunobavofan.pdfIn PDF document text
- http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/65076681714.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_008_off0001f3d5.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1F3D5	18180 bytes
SHA-256: `824e08445d8686afaeb9327fcc51b22c03225572ac8933f0b725af709cc5a842`
`font_00_sfnt_off000189cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x189CD	23576 bytes
SHA-256: `50ccb10e92d260937273da7891864f048c2ebe0970c8a4b4c3b104cbc1b47aef`
`font_01_sfnt_off0001c489.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C489	10260 bytes
SHA-256: `949a1103c49e66255ed1d6c3b85932e13398ae32fe638aba94f7a9b7ac4cc3e8`
`font_02_sfnt_off0001dbc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1DBC4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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