PDF malware analysis — malicious · 459bc2ad3d62111e

MALICIOUS

PDF

76.9 KB Created: 2021-09-25 07:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 1331c5e19b8bb3d4ac56e48b12da04f7 SHA-1: 89aca4d88901980b66d73cab1db1ecfb53ffafd7 SHA-256: 459bc2ad3d62111eecb9d7709914e812c67ffaafc8b87689df644cec1771dc71

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests it's a social engineering attack designed to trick users into running commands, likely to download and execute a secondary payload. The numerous embedded URLs point to various hosting locations, some of which appear to be compromised CMS uploads, further supporting the malicious nature of the document.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
ClickFix social engineering attack high SE_CLICKFIX

Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
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://9y.bfage.com/upload/files/20210919065439.pdf In PDF document text
- https://presstone.hu/userfiles/file/nutufex.pdfIn PDF document text
- http://hyundainhapkhau.net/upload/files/44123373978.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134688f658bd---32958313421.pdfIn PDF document text
- http://barrospizzadb.com/uploads/files/finonelol.pdfIn PDF document text
- https://dampinggame.com/calisma2/files/uploads/31196327589.pdfIn PDF document text
- http://kaymccarthy.com/immagini/file/6397129002.pdfIn PDF document text
- http://jessie.vn/images/ckeditor/files/13041484234.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1ea61948d1684b1a702a3e480808b022/3812275897.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63ea1007c---rikusigunagevapa.pdfIn PDF document text
- http://myphamlulanjina.com/upload/files/ruxafevobelemilixinigu.pdfIn PDF document text
- https://officialbacknumber.org/editor_up/gogazalofitozapivi.pdfIn PDF document text
- http://marupi.de/UserFiles/File/71878804004.pdfIn PDF document text
- https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/larutedusejifuf.pdfIn PDF document text
- http://www.focitabor.hu/userfiles/file/fuzasapi.pdfIn PDF document text
- http://www.vegagastro.pl/upload/file/60187762500.pdfIn PDF document text
- https://liftsystems.ro/LiftFiles/file/2894173490.pdfIn PDF document text
- http://www.adarshvidhyasankul.org/userfilesfile/movumowowejimibozip.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f131442b3a36e5a479900aa950a266bf/18053467972.pdfIn PDF document text
- https://heatingboiler.ca/fck_upload/file/jagozif.pdfIn PDF document text
- http://roocenter.ru/upload/file/zigobotavapototib.pdfIn PDF document text
- http://thegioidahoacuong.com/uploads/image/files/70649402474.pdfIn PDF document text
- http://winterwonderlandzundert.nl/uploadimages/files/77796770063.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=in+my+device+managerPDF 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_off0000c430.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC430	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC42	19452 bytes
SHA-256: `a3a79bcee823e575cf65d7973172d183e816bc9da00b29fd34555797da48eb49`
`font_02_sfnt_off00010ebd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EBD	10412 bytes
SHA-256: `5292fb087c783122cdd78b6ec3a20206a90f3405d88e30c5e79616726f37f17d`

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