PDF malware analysis — malicious · a588d57890c27c61

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 22:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 033b50b81c2246e2592e3ef8882fea84 SHA-1: 0bd0d69c07f21b4c641b3f0c2f9a3c8aaef465b6 SHA-256: a588d57890c27c613fc5eee27c7b0c1389eecc67e72e32d5624bbe42d8780079

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, indicative of a link farm designed to lure users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or malware distribution intent. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=kornspitzdi%C3%A4t+wochenplan+pdf PDF link annotation
- https://fetogram.com/images/upload/files/rixurefunedugulajabexuzol.pdfIn PDF document text
- http://anatolianlgs.com/userfiles/file/15402724963.pdfIn PDF document text
- http://naucseto.cz/storage/tajusowugetiwuju.pdfIn PDF document text
- http://espokebar.com/uploads/files/84425049273.pdfIn PDF document text
- https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/8nm6b6a09hvtsilh50uaokg441/lijobadidazezip.pdfIn PDF document text
- http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083b11e1ee5a---guwilojiroponodowimam.pdfIn PDF document text
- https://brianspradlin.com/userfiles/file/wosasetunutut.pdfIn PDF document text
- http://savalis.ru/userfiles/file/zopedadunevafidelozaxorew.pdfIn PDF document text
- http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nasep.pdfIn PDF document text
- http://studiofapas.it/userfiles/files/xokiniputi.pdfIn PDF document text
- https://adepotcustom.com/UploadFiles/file/20210620123234173.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9cc1c55e8---30896696471.pdfIn PDF document text
- https://uleshuzataruhaz.hu/files/file/34127203386.pdfIn PDF document text
- http://dioceseofniranam.org/userfiles/file/4324755355.pdfIn PDF document text
- http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0586b75c119feeb77e57203a204fb399/50529042982.pdfIn PDF document text
- https://stijsr.com/userfiles/file/25018113519.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/opkc6k5nq1sognihhroiru80r7/6034482632.pdfIn PDF document text
- http://dj-maily.com/uploads/pages/files/kofenomomamojevedev.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/8114155081.pdfIn PDF document text
- https://umartravel.com/files/59748376676.pdfIn PDF document text
- http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/94506244778.pdfIn PDF document text
- https://antae.be/app/webroot/uploads/file/40684693658.pdfIn PDF document text
- http://vwtint.com/userData/board/file/45831807117.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bed590523d2---1088717129.pdfIn PDF document text
- https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/168d41ec5ab7773c43c4ac7e9e443404/karifemuvepen.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_off0000c9c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9C6	19136 bytes
SHA-256: `5b98682a23bad6b61d6cbcb66d5f167287b2a7092c8ce6f9e5d93d7af9700f1a`
`font_01_sfnt_off0000faba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFABA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000112d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112D1	11112 bytes
SHA-256: `fd124bfaf7d3bad6beb12b9ca67883b73e6a26ef0b792d5f87c6a7f8b1a5bd8c`

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