PDF malware analysis — malicious · 253d3808e6a31e69

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 18:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: bc4669e81bbf52d52d5ee266c5e29196 SHA-1: 794f7cf65584091dad9a96bec6ac8b70a36467d8 SHA-256: 253d3808e6a31e69582ea9f4bde3f3cb9fc0da414dfb817d59f8ff4943de2c4f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=peugeot+2008+manual+del+usuario PDF link annotation
- http://schokobrunnen.com/idata/korowuf.pdfIn PDF document text
- http://inistor.com/ufiles/files/pifedudiri.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd723a6ba7---30639617266.pdfIn PDF document text
- https://papiratisk.cz/soubory/44070320695.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc45ed826e1---12201468181.pdfIn PDF document text
- http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee78eb23e---52891296057.pdfIn PDF document text
- http://ulv-fogger.ru/d/files/wuletowugemijasizosir.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8d3eab2e795d9ca0985215da8b3d0e90/dulukuduzeruxubufeketar.pdfIn PDF document text
- https://ikansambel.com/contents//files/28221039417.pdfIn PDF document text
- http://labonguyenhoang.com/img-chamthi/files/69324646103.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/029c315f08a491eef7ab38ac1dc66eb3/71516039926.pdfIn PDF document text
- http://clairerolo.com/userfiles/file/nilaweva.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f83a0446458---61162852769.pdfIn PDF document text
- http://websteravelandscaping.com/editorData/file/80871594817.pdfIn PDF document text
- https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ff661c2ae0ae9a368a5115e7ac04a838/3547753888.pdfIn PDF document text
- https://ph2020.org/FCKeditor/file/jaginamitatagox.pdfIn PDF document text
- http://fujavietnam.com/images/Download/53284674722.pdfIn PDF document text
- http://oticonshop.com/ckfinder/userfiles/files/58075093977.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c04d5be227---girorupawaxasokusegik.pdfIn PDF document text
- http://s8radziejowice-paszkow.pl/userfiles/file/koponat.pdfIn PDF document text
- https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/mjcvomcdo7iiaa6teggbp41p6k/33716688855.pdfIn PDF document text
- http://nhasachnguyenvancu.com/Images_upload/files/16157105326.pdfIn PDF document text
- https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/12912a7e7a5980ffb3a685334c1cf73f/85868114383.pdfIn PDF document text
- http://www.cenlaenvironmental.com/siteuploads/editorimg/file/21136699265.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_off0000cb81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB81	18848 bytes
SHA-256: `70c867b355a71db0f4f71c5392a31f60c9f4fddb4bd1639df1abfdf2c4fbb562`
`font_01_sfnt_off0000fd1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD1A	11140 bytes
SHA-256: `227f1475cdf54eadc8d828163ea9e220ab4de8a6723c1c3ef20e3d25ea6011d0`
`font_02_sfnt_off000116fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116FD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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