PDF malware analysis — malicious · 677e4b5014c5d5e7

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 09:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 49a577f5a35f0b1f3113c2f0283eb196 SHA-1: 1b0ec04453ec88364bf83a3d0473aba2bad231d2 SHA-256: 677e4b5014c5d5e7b7c75ede1071642a65573d2cf4953627ae50d3d955cbd219

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised CMS uploads. The heuristic 'SE_QR_LURE' suggests the document may also instruct users to scan a QR code, further indicating a phishing or redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

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
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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://irlanc.ru/uplcv?utm_term=boolean+equation+rules PDF link annotation
- https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/rovus.pdfIn PDF document text
- http://gardenofsound.com/userfiles/files/29618195450.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e32e1bcef---mudexivu.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7c82715d1983ea174981deb941f5314a/47494097899.pdfIn PDF document text
- http://skidubravy.sk/spravca/ckfinder/userfiles/files/9735295599.pdfIn PDF document text
- https://fong-cai.com/upload/files/bebajix.pdfIn PDF document text
- https://bimstudioinc.com/media/files/kujovorusabotuja.pdfIn PDF document text
- https://jajugroup.com/ckfinder/userfiles/files/sijajubeta.pdfIn PDF document text
- http://www.pattyn360.com/upload/forum/files/40483171532.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0bea2cf384f559df8c40c6775304da9a/jewezuxuzokovi.pdfIn PDF document text
- http://heatexchangersolution.com/upload_fck/file/2021-9-13/20210913125232516431.pdfIn PDF document text
- http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d5e6f671ca1a189c405a8eb417b048a5/44462907588.pdfIn PDF document text
- https://chaletsuenodesol.de/files/12137205952.pdfIn PDF document text
- https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8c35bfb7012b9b08c7ef9745b49a0f9c/77204939775.pdfIn PDF document text
- http://phamtrangia.site/upload/files/gegovazuxedugekonarisuze.pdfIn PDF document text
- https://vyaspublicschool.com/ckfinder/userfiles/files/46284185958.pdfIn PDF document text
- https://dammesliepas.lv/ckfinder/userfiles/files/wajiveturegebidimibegig.pdfIn PDF document text
- http://xn--h49al71atridzo.com/userData/board/file/91125943607.pdfIn PDF document text
- http://cungcapbaoduongcuanhatban.com/upload/files/lafiremazirarejuripukipib.pdfIn PDF document text
- http://challendor.com/fckeditor/upload/file/magumukes.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9h65ll341tv3s32njl29p1ul27/22276263396.pdfIn PDF document text
- http://4bx.pl/public/file/80289906937.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_off0000e1be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1BE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f9d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9D0	18536 bytes
SHA-256: `083d05257e813406f1402b6d0772e7b55989e6151b76687439ff0a1b7b5c1752`
`font_02_sfnt_off0001299a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1299A	10400 bytes
SHA-256: `2d1b8121de13bb41bea5c457e567d08843c1718173d10153a93a48fcd1d8299c`

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