PDF malware analysis — malicious · cabc68ac98172b42

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 04:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 6a7b45c26562d86f18bc65b1d7dd649f SHA-1: 9191de5cb159eb9e1d88174a116fa93b6c4676f2 SHA-256: cabc68ac98172b42e9b6dcb91ba1b071dbf7bc3dede22a8cd0a4f3a406f69a2b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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 https://philabc.ru/uplcv?utm_term=biotechnology+science+for+the+new+millennium+pdf PDF link annotation
- https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5vte1u3s218lg8jt402b4h1ld6/95724640179.pdfIn PDF document text
- http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc60896e45---81751762348.pdfIn PDF document text
- https://stratasphere.online/userfiles/file/piloweworelidefudagi.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1183a8c3c---belejeborilitibewuxenik.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/89cf5071b258b2075cb386a5a540b6ef/49425327234.pdfIn PDF document text
- http://canxetaidientu.com/images/file/57051472115.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3e3c10a35---4096635649.pdfIn PDF document text
- http://granite1962.com/clients/869125/File/40984937361.pdfIn PDF document text
- http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1cd648246---80814121981.pdfIn PDF document text
- http://bannhuaduong.net/upload/files/kogomuleponofexapudaxifix.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb5507d15a---34542389696.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rjpr6mlfrako16k39ffhiqolc1/jozawebujupav.pdfIn PDF document text
- http://zkojicin.cz/userfiles/file/fobusipetapusisetogiboma.pdfIn PDF document text
- http://www.gamylai.vn/uploads/files/56011903647.pdfIn PDF document text
- https://alnahamgroup.com/userfiles/file/40760535231.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cfad02beb56beb374b5c437047f91cc6/norewiwilenop.pdfIn PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9532f079---65360164042.pdfIn PDF document text
- https://baxsporthorses.nl/userfiles/file/67195591149.pdfIn PDF document text
- http://ahsaipu.com/v15/Upload/file/2021521650566255.pdfIn PDF document text
- https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fgm76bp4mstr6o4bkvatt12b1i/jonuvojamedijopoburejal.pdfIn PDF document text
- https://mudraconsultancy.com/uploads/files/fajisuwo.pdfIn PDF document text
- https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4893d1196---dunilarosulafexivididu.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6500a804b3---30902155407.pdfIn PDF document text
- http://fogathajtohirek.hu/fckfiles/file/39239892379.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/3047c7dbad04d8280ed1135d134bf0b4/naledazusolize.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_off0000f61c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF61C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010e33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E33	11256 bytes
SHA-256: `f6ba05eed712ff0a2df315e3b36c70a32d77b9ee58bf35e9857ef31b76b4fa12`
`font_02_sfnt_off00012850.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12850	17116 bytes
SHA-256: `27a77400e468776e5b9d702d286af44f1ace3d758f372ca0fe8575c48f9868de`

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