PDF malware analysis — malicious · b035a0f2a0d2b2cc

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 09:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 4e6fa9e576bd283d901d28d1c3b79260 SHA-1: 8619cf0d173668fc98667f5659f70b9d64bb34f1 SHA-256: b035a0f2a0d2b2ccce845a124b10c7f8136d24a29abc80dbd7aa1d84ee22f9b1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to compromised websites, many of which are WordPress installations hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests a tactic to obscure the ultimate destination and leverage existing vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

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://wastran.ru/uplcv?utm_term=vegetasi+adalah+pdf PDF link annotation
- http://hoigolfbinhthuan.com/users/files/tumakafe.pdfIn PDF document text
- http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922a2ff282c---xurobenomolefedor.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdb92fd40---jizit.pdfIn PDF document text
- https://2acontractor.it/images/file/70448577225.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/cf29702678a6b861de5e244026bfba7d/zadeladowarumij.pdfIn PDF document text
- https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/21otovidhgh4657genkkbhunkk/64209356034.pdfIn PDF document text
- https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f60a88a204fb01f6586e7f8a3c1dbd80/55156970665.pdfIn PDF document text
- http://yourbuilding.ru/userfiles/files/58997360608.pdfIn PDF document text
- https://laflammerouge.ch/userfiles/files/9454602008.pdfIn PDF document text
- https://liantoong.com/archive/upload/files/zaxorimiputoxinujubez.pdfIn PDF document text
- https://eobliecky.sk/userfiles/file/1408799053.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/aabf2a3e5d5c772258407b6b7240a669/xesunekixukalo.pdfIn PDF document text
- https://lotusmarinevn.com/upload/files/zetifereguxapofojopobuzad.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611542db474f7---37227147098.pdfIn PDF document text
- http://fmi.lu/userfiles/files/98101267792.pdfIn PDF document text
- https://music-group-store.com/upload/files/sofexukuzibuzo.pdfIn PDF document text
- https://anhhuynoithat.com/asset/files/84210618328.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612a56af24d04---17321597060.pdfIn PDF document text
- http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608503012748a---6827178931.pdfIn PDF document text
- https://theshamrockpublecco.it/file/19194425211.pdfIn PDF document text
- https://asharfilalkulfi.com/ckfinder/userfiles/files/79401469953.pdfIn PDF document text
- https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/p4jjbho6kajc7egsqd7ugho1bu/60176688965.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e024ba1d6---bobavejobuwulol.pdfIn PDF document text
- https://forumhrdbekasi.com/webroot/userfiles/files/99328401661.pdfIn PDF document text
- https://taechoclub.com/FileData/ckfinder/files/20210615_388187AD53A3ED00.pdfIn PDF document text
- https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dceh7dgf5id1j58199bcmgak9q/28421320709.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_off0000e06f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE06F	10424 bytes
SHA-256: `45b331755c45e0a9e88b3d609561ee7656e92d1d924044ef22b587c661801b7f`
`font_01_sfnt_off0000f7fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7FB	16144 bytes
SHA-256: `fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516`
`font_02_sfnt_off00010d7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D7A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001258c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1258C	16380 bytes
SHA-256: `dba9ce7e1f09b91718ea4a9017a54da051a2fd7d78443390be7979138c09a65a`

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