PDF malware analysis — malicious · 4adcbecb27781335

MALICIOUS

PDF

84.7 KB Created: 2021-06-25 16:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: ac1924dcb508f6f46c12b5a4b842e14d SHA-1: fad88b88ed4fb3f720087f552db4fe965be78b86 SHA-256: 4adcbecb27781335c9c457f20137c52f5c01bf6f4cb9b50938441e84ce5bf79d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ClamAV detection and ML classification. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable domains. The PDF contains numerous embedded URLs, suggesting an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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=mappila+song+download+mp3 PDF link annotation
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608146f93590a---324750358.pdfIn PDF document text
- http://baraanduliaptti.org/userfiles/file/47505729943.pdfIn PDF document text
- http://daedukgs.com/admin/fckeditor/data/file/20210612205036.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c040d88b245---37673395085.pdfIn PDF document text
- https://unique-u.biz/images/uploads/file/91002132035.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8f709b35b4417268c52a5162267715d4/gorufokumudujovu.pdfIn PDF document text
- http://gwardiajuvenia.pl/zdjecia/fck/file/topavokoga.pdfIn PDF document text
- http://reikihaus.com/clients/75291/File/luxajuto.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c799b495a99---nugolewetoledi.pdfIn PDF document text
- http://caycanhtuyhien.com/uploads/image/files/muliwokevujaxiraxa.pdfIn PDF document text
- http://shinies.ru/img/lib/file/fosalarepopuwixi.pdfIn PDF document text
- https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/i9rfloeif085jd9v59qk63th1o/21826553490.pdfIn PDF document text
- http://nemdanangpho.com/uploads/2021-06-02/images/files/92680244904.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7m7kusbqs9kncklodpli4klb83/15824424358.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/58837af394d5a9c7e158f4fbd6cb7d97/38932727774.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/tcoc5rslu3rt48n2kai64euik0/vugizowobalaz.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_off0000e8bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8BF	17140 bytes
SHA-256: `f5663c5b07783c98d4584c94b162d599c36b318baeb7a1c00ac4e8912c1451d4`
`font_01_sfnt_off000115b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115B7	10656 bytes
SHA-256: `dc02e0a91ce882fa501978cca070af97cf8a11d55a3ebb1e4917ac3689865d23`
`font_02_sfnt_off00012de9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DE9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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