PDF malware analysis — malicious · e885d78d24353ec5

MALICIOUS

PDF

82.0 KB Created: 2021-08-20 21:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: b4594a84ccd7b132d2b1add907bc1d26 SHA-1: da131c82d457591ce8bcf1809a7bef16b02030d9 SHA-256: e885d78d24353ec58cebb778f3f21641d94465d2027c7b25b46f9e15c04d8d94

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://deltools.com/userfiles/file/46444515318.pdf In PDF document text
- https://suativisamsungtaihanoi.net/upload/files/29926235997.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/746ca49793fc74c528a0aea2e06c3f4a/dubelurarovesavekegapak.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122e7e7213---59781271994.pdfIn PDF document text
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e4b9ccb7648d4bb057bc735b138432ec/kibujabenarabosulaxanusar.pdfIn PDF document text
- http://recko.ru/ckfinder/userfiles/files/kuwexodivu.pdfIn PDF document text
- http://webinaris.blog/ckfinder/userfiles/publics/files/saponana.pdfIn PDF document text
- http://www.pranabkumar.com/fckimages/file/87583736399.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c4e60deb9---zujozujovewiwagegugum.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/8863c6f3bce5289f3a679540b27c5cf2/sibamivovapafabefudobumo.pdfIn PDF document text
- http://hflchw.com/upload/file/xuperupewewixe.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6131ae143---80357068991.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5c495245e558ee4abfe58ccee0d19167/zugixukageken.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4719479a24e1611ef21caa0e7faea98d/3741947036.pdfIn PDF document text
- http://prefinancovaniehypoteky.sk/res/file/28294452892.pdfIn PDF document text
- http://daeryuhealthcare.com/ckupload/files/4666289662.pdfIn PDF document text
- http://hotelniagararimini.eu/userfiles/files/76677054151.pdfIn PDF document text
- https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/429b75e92eb772236eac8beb0bd7de03/62078141445.pdfIn PDF document text
- https://castel.ro/userfiles/file/35202372672.pdfIn PDF document text
- http://lorichphoto.com/pictures/file/95018367285.pdfIn PDF document text
- http://coronado1977.com/clients/54390/File/padovesidaja.pdfIn PDF document text
- http://studiotecnicoprato.eu/userfiles/files/ledejuwejawawowokix.pdfIn PDF document text
- http://lab4050.com/upload/editor/file/84579149689.pdfIn PDF document text
- http://hosungtour.net/FileData/ckfinder/files/20210622_117D092A3D9199A4.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=free+foods+on+slimming+world+2020PDF 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_off0000dc73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC73	16748 bytes
SHA-256: `d85eea06064061cf7a1440cf67f29fb59464350a93f1abfae369104c606cc131`
`font_01_sfnt_off00010803.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10803	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001201a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1201A	10740 bytes
SHA-256: `04560451ea6804a621b3b8e301df36b8af68afaa4dacdb3eddf8eb3981bc6a35`

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