PDF malware analysis — malicious · c813a03987b0efee

MALICIOUS

PDF

90.2 KB Created: 2021-07-09 22:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: ecd54e3feaf0ae5e5fb367234f72e396 SHA-1: dcf4d1f53cf0a3928801cb1f929a6d0ab17a27b2 SHA-256: c813a03987b0efeecfb22dba16c8f7f5eb8beb7489658cc5cd36ed753a2b205e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into phishing or malware downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://medvor.ru/uplcv?utm_term=discourses+and+selected+writings+pdf+free+download PDF link annotation
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084188e8d2fb---50222935841.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0b25dc2eae32c7afcded42675cb0960e/rilopa.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777182341c7---vulapepowowukap.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609109ab9cf7e---48117259614.pdfIn PDF document text
- http://entryexpress.online/chapter_images/files/fufakefoliguwat.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/573a69f43b4bf829f4cc93373995d37c/rinorode.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2a10de5a---29878009547.pdfIn PDF document text
- https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/bee1d9c5c50722fb19e740ba760b3069/72939037438.pdfIn PDF document text
- http://ztkammer.at/uploads/file/pazuki.pdfIn PDF document text
- https://nutricount.cz/UserFiles/File/14759383140.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e1d0dd4b409ccd53405f38fee491502b/wutuziwijonenifaxetoru.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e4bd394d---88778845112.pdfIn PDF document text
- https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0a422e114d54b134b6016ae29a0c25c6/39504877052.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/8cbb46a44f0d1f418e3550bd5f5a65a0/7979782379.pdfIn PDF document text
- http://weddingdiy.cc/uploadfiles/files/20210703_105424_8133.pdfIn PDF document text
- http://villa-carlshorst.de/sites/default/files/file/lipifewimokodazogog.pdfIn PDF document text
- https://presentkompaniet.com/img/content/file/55883321231.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b69b914af5d7e32a81009b8cb8a38c66/92777990053.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a77e2e41684---xopowegataxusiveg.pdfIn PDF document text
- http://onlineexpert.in/userfiles/file/jisiwopulufefaniwuwu.pdfIn PDF document text
- https://themalc.org/files/file/mojelizujanaxuluzasevag.pdfIn PDF document text
- https://wsbtitan.com/images/file/20985273318.pdfIn PDF document text
- https://turdv.ru/SITE/files/editor/file/85663197438.pdfIn PDF document text
- https://inverpalmas.com/aym_image/files/31741887194.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
`font_00_sfnt_off0000ecc6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC6	10980 bytes
SHA-256: `ba77f924ce213cde127c353601f7c436f8b892d922bfeb867d68d3e3e88ef7c4`
`font_01_sfnt_off0001063e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1063E	1800 bytes
SHA-256: `cb2d23ba59d6fab898ac4861c5a4e22643c1fe5c039578fe3c63b16aaee6607f`
`font_02_sfnt_off00010eb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EB5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000126c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126C7	20364 bytes
SHA-256: `eebfa2b0acb5db72e80a97281d69ccfe70753576a5ec98ab8b4816316ac9862d`

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