PDF malware analysis — malicious · 47b7565a11f587b7

MALICIOUS

PDF

89.4 KB Created: 2021-07-18 22:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4811270b6a88c9a83ea5f0931e24a56f SHA-1: 2762bc509eb386777c42cb8942e4a384b2cd1655 SHA-256: 47b7565a11f587b7d2de862b8ad6ddd22861772a3b7c856161128a7903832e81

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. The ML classifier also strongly suggests maliciousness. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or SEO poisoning attack designed to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://formel1vermietung.de/userfiles/file/94516637375.pdf In PDF document text
- http://allaboutdowney.com/userimages/22571528444.pdfIn PDF document text
- http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ee504ed9---tisixunoxepizonegutunozuv.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c0dfb4158---40008561407.pdfIn PDF document text
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7ba79ggs4dm2e9ij61ekm4hvg2/walawuxewafemurovarojivip.pdfIn PDF document text
- https://aterhesseg.com/up_image/file/lifon.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2f72760755fd4ae8abe7c87a2b67f8b2/17158858017.pdfIn PDF document text
- http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c0aff0728---12298587612.pdfIn PDF document text
- http://sushiosushi.com/uploads/files/mebekugemujarajoguparap.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc4ae42d7---3512202824.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6a9eb05b---nuvub.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/g2j1ii6i5qtbe0q4nrbjdfr5a4/63461693876.pdfIn PDF document text
- http://capesociety.ca/uploads/files/84482342831.pdfIn PDF document text
- http://dpsszczytno.pl/photo/file/putonosilajo.pdfIn PDF document text
- https://ocbond.org/userfiles/files/gafigupazemumelu.pdfIn PDF document text
- https://noddy.nu/images/file/9724354058.pdfIn PDF document text
- https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/2dd0f0afcfb12811957fcb5808e855fe/93175203711.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/14234882847.pdfIn PDF document text
- http://euro520.net/userfiles/file/1622501580451615345.pdfIn PDF document text
- http://a-kamen.com/userfiles/file/sufuzamefuluwuv.pdfIn PDF document text
- http://partnerplus30.ru/images/fornews/files/gurirebelekizafisasijew.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7fa4cf69---44712106144.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d256349a07---vuzowelerava.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5e9376019486db2963fe57d009852207/gigezigufam.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850a98ba868---44841419720.pdfIn PDF document text
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1e85a9bba---sowigajajogal.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+smallest+unit+of+lengthPDF 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_off0000f83f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF83F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011056.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11056	10624 bytes
SHA-256: `eaf27d94e84339fb38356779b672b132c4af028eddc77f781c8fd6b34f240bc8`
`font_02_sfnt_off00012873.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12873	18232 bytes
SHA-256: `43818ebceed7d8bc008ef479025ea8cc606b505dcc980ca18b0e841b6825c4a3`

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