PDF malware analysis — malicious · 3564b5ddb6a0a4c2

MALICIOUS

PDF

89.7 KB Created: 2021-08-26 12:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: 1072d33bbff9af66f23c8a7c744a9af2 SHA-1: 3612952811b2b0a8c3ac74ed151a40aabe501b26 SHA-256: 3564b5ddb6a0a4c25bacebd45dd3d952fec1e3d3b2a3f51381f03d11a115f44c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

Nyx PDF Classifier malicious score 0.9906

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://dienvietbac.com/uploads/files/11253055631.pdf In PDF document text
- http://hmsendo.pl/uploads/editor/file/dasemom.pdfIn PDF document text
- http://tonystelly.com/clients/873487/File/39210566907.pdfIn PDF document text
- http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/mibifanisojemonot.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1975e5ecf---18694158487.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608acefce89f7---1771134598.pdfIn PDF document text
- http://www.siposferenc.hu/html/fidilovanufesa.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/tonawugera.pdfIn PDF document text
- http://xsteelstock.com/d/files/lofov.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lfs40qgunfvrd7htl9b9mlqugc/60020182220.pdfIn PDF document text
- http://vivaibonomo.it/userfiles/files/kagelepotipovorif.pdfIn PDF document text
- https://ofertaromania.ro/ckfinder/userfiles/files/65659571571.pdfIn PDF document text
- https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vhchvapvlla42sesp9aef72in5/4634200882.pdfIn PDF document text
- http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/32e788ac34bb922f6f20743e8c5eaf4a/84811610482.pdfIn PDF document text
- http://aceonlinementors.com/userfiles/file/95404620987.pdfIn PDF document text
- http://congtyvima.com/images/Download/fipinolotuzalito.pdfIn PDF document text
- https://dm288.com/slicice/file/mitemikasedikor.pdfIn PDF document text
- https://bangprice.com/bangprice.com/beta/cms_image/file/nupipidamoluku.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb551947030---vodibuno.pdfIn PDF document text
- http://www.aluvascientific.com/UserFiles/file/moponewepujotidobefotawoz.pdfIn PDF document text
- https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/s9a507p6i4r7h3ao0pdghro517/95832497235.pdfIn PDF document text
- https://navliecky.net/userfiles/file/labixilexogopupapunefusaz.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7cf54ea79---pulokulupimuxagojowawe.pdfIn PDF document text
- http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778a8c967af---2379113047.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072004e130fc---lonukusejotusawedulipa.pdfIn PDF document text
- http://gerastar.com/userfiles/file/gitogokoketid.pdfIn PDF document text
- http://vizugy.hu/uploads/files/files/6522957039.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+met+cloisterPDF 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_off0000f724.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF724	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010f3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F3B	10192 bytes
SHA-256: `c3779cdff9e0e7d7de03368df6ae629515669f98af36e6f24706ffb2b7bcae2b`
`font_02_sfnt_off0001260c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1260C	19304 bytes
SHA-256: `42c5635c646fd13f6cb0aa3342cd9913e2a34fefc593904a1e6407d9195fbee7`

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