PDF malware analysis — malicious · 4b3ca5e7993c7363

MALICIOUS

PDF

86.4 KB Created: 2021-08-30 16:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 5d33eae33f11d0d8869e40a23b1c62fe SHA-1: 354acba11e3aac5672734f5279b34058f11fd4ad SHA-256: 4b3ca5e7993c7363c831ab8c88cfb1119f4666c44567c672cbdec4d92531120e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malicious redirection attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://111-orte.de/testarea/cwsCMSlight/media/files/bojanu.pdf In PDF document text
- http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/6950938836.pdfIn PDF document text
- https://rdw-wolf.de/backend/ckfinder/userfiles/files/xeboxevateduwemoraxowimuz.pdfIn PDF document text
- https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d55569879c1---11388308728.pdfIn PDF document text
- http://giaodantanthaison.com/Images_upload/files/94757322866.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eh4cpk7o7m9l65j2n0ffrcfp22/zegas.pdfIn PDF document text
- http://stlukesmn.org/clients/17773/File/92125219204.pdfIn PDF document text
- http://hoangle.vn/uploads/userfiles/file/49552120408.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160830d8643ea9---jotubowawusumevezulu.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c48363239e---39201721664.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4c1068e9c---digevefe.pdfIn PDF document text
- http://am-assets.com/aom/magnolia/userfiles/file/vofuwulugukab.pdfIn PDF document text
- https://pjkconstruction.ca/images/file/vukujobevovutofiwukeda.pdfIn PDF document text
- http://nguyenthaotech.com/upload/files/31546834792.pdfIn PDF document text
- http://siciny.pl/userfiles/file/81694308100.pdfIn PDF document text
- http://georgekoldun.com/var/upload/file/zoxaka.pdfIn PDF document text
- http://jjmcp.jp/userfiles/Image/file/12926314961.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3e9973ed7---32741485502.pdfIn PDF document text
- http://0965818789.com/CKEdit/upload/files/verabufevep.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/58309307131.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cp3d62rtsi1h1j61419uass9o3/65189752732.pdfIn PDF document text
- https://walkandsmile.com/userfiles/file/30002858475.pdfIn PDF document text
- https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/057829e34c02db77a703c5fe560a63cd/sibegesenus.pdfIn PDF document text
- http://arc-en-cielproduce.com/ckfinder/userfiles/files/13741783206.pdfIn PDF document text
- http://gyuco.com/uploadfile/files/20210816_115112.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63aab97e8---mebusuxaw.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=impedance+to+admittancePDF 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_off0000e7cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7CB	19420 bytes
SHA-256: `53f2db503e700cbbc12766d12f70facf4ff11962978c5582f98cb878fc18f5ef`
`font_01_sfnt_off00011b3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B3A	10312 bytes
SHA-256: `8686170340a8a0e80c5c4fca2473534df692b1be4837ae526c574a1139ffc3e4`
`font_02_sfnt_off0001326b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1326B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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