PDF malware analysis — malicious · 2affb83f9d7e77bb

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 10:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03

MD5: 21b8bec474b38993011115a636754579 SHA-1: da1a6291e60c0f007e48bb8173eb8949d523e796 SHA-256: 2affb83f9d7e77bb0a6dabc6303530a35a001197cbcbb4d01efd3d0ae7a629c6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lead users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=spring+bloxburg+house PDF link annotation
- https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/15000978416.pdfIn PDF document text
- http://britishcytology.org.uk/ckfinder/userfiles/files/fenixojodolodut.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1bfdad87---95501405066.pdfIn PDF document text
- https://sukienmiennam.com/userupload/files/feliroxenaf.pdfIn PDF document text
- https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7660c0a9b9c9e9ac480a900bd19139b6/15836791564.pdfIn PDF document text
- http://gzcil.com/uploadfile/files/63310245472.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/tulur.pdfIn PDF document text
- https://digireg.it/upload/16012860059.pdfIn PDF document text
- https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/mizokij.pdfIn PDF document text
- http://dydlhx.com/upfiles/file///vunitukez.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135d4d5c2c4e---57347603498.pdfIn PDF document text
- http://tottazo.com/userfiles/file/82339641253.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361628b812b---nafizakaxamo.pdfIn PDF document text
- http://novichiha.ru/pic/file/86707756394.pdfIn PDF document text
- https://sunkamalzemecilik.com/userfiles/file/fokaneledifek.pdfIn PDF document text
- https://vcubusinesssolutions.com/userfiles/file/77005235963.pdfIn PDF document text
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161315ea381360---bewawokulo.pdfIn PDF document text
- https://traffictkt.com/viking1/uploads/files/28659349974.pdfIn PDF document text
- http://archgeo-leszno.pl/uploads/userfiles/files/71933013645.pdfIn PDF document text
- http://barsugo.com/ckfinder/userfiles/files/87034976891.pdfIn PDF document text
- http://auto-rad.pl/userfiles/file/31684891504.pdfIn PDF document text
- http://dryoucosmeceutical.com/userfiles/files/wavenopegebitadamalamiw.pdfIn PDF document text
- http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/lopetuzizu.pdfIn PDF document text
- https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/givapopuzofutedewuxufox.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_off0000c4aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC4AA	16880 bytes
SHA-256: `50a286460803b01c8820852888d4858d9f021b6b88a366015855e15849ff8a83`
`font_01_sfnt_off0000f00f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF00F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010826.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10826	10688 bytes
SHA-256: `e2d94e650bf1b7a338f669edc02d7555555b251c5645d6693dbd40ec04414901`

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