PDF malware analysis — malicious · 0244523b06384044

MALICIOUS

PDF

74.8 KB Created: 2021-06-28 23:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04

MD5: 0d67591ff34e54b7930e49871b10958e SHA-1: f9b546f25bb7422e28519dae155af0df0fc26d0d SHA-256: 0244523b06384044e90a8bc71eeaa75857feacecdada7390ef8141d64428a28b

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9753

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d443bfb0883---revodonakofujomaluw.pdf In PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/qfqmf6g4b49b8n0qodivopipcl/nowavuvikejatuxu.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/65735922085.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae17e8f473---xabobapugiso.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c254ce8e---44589042063.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d1490bfd0a3816fd1161438e172f03c6/68280438243.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc8841f18---67919480535.pdfIn PDF document text
- http://reguitti-engineering.it/userfiles/files/3145538327.pdfIn PDF document text
- https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2f2b25c1e7adbd3046bbefb27c093449/44758536019.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee598ecd4---19062563153.pdfIn PDF document text
- http://aimic.com/userfiles/file/85693106194.pdfIn PDF document text
- http://itineraire-consulting.com/ckfinder/userfiles/files/90444331282.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d51e2ab3c05---13769047743.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4627abd578---17717999753.pdfIn PDF document text
- https://mttrasportisrl.it/dati/upload/file/18463318042.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d901a42aca9---57531144939.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce386ccf4---latubifota.pdfIn PDF document text
- http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/atdoqvdlc0v3lml16otmner8mp/44174811052.pdfIn PDF document text
- http://www.alex-vasilkov.ru/images/wisdom/file/tapezilawudazupadenito.pdfIn PDF document text
- http://gursakaryahukuk.com/images/file/takimujiruxitupudexaja.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/efc4dfc689305cebef6d3241c91eab79/migeburimosoxetim.pdfIn PDF document text
- http://tzoetemondje.be/uploads/files/tuximebabawofetonikobi.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6bfe3e011266c246842d03fa63cf293d/bidesasugizigebevoxulizi.pdfIn PDF document text
- http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160852c305921a---81672623904.pdfIn PDF document text
- https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ac0de82301d837261405286ba03e0184/riviximovu.pdfIn PDF document text
- http://tuanayapim.com/rsm/files/zisokitul.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd211e68a0---pixiluko.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=converting+ms+word+documents+to+pdfPDF 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://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_off0000c33a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC33A	18104 bytes
SHA-256: `e870f80a5d2f0d7a4c4950770275d847874ed956b4dcfe42e81eaa9fd06177cf`
`font_01_sfnt_off0000f0ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0EF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010906.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10906	11036 bytes
SHA-256: `4d3c0763d4d2f5e7f296cd0464943c7b7c404ab445fb17e4074168d6e3aa2bfb`

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