PDF malware analysis — malicious · 8b7f3f4f771ac1e5

MALICIOUS

PDF

108.7 KB Created: 2021-07-08 03:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: c4bac72f316f14e8c6635e677b07bbc0 SHA-1: a21e9e39a818bcdcb4dd43bd4f64612dc24f3035 SHA-256: 8b7f3f4f771ac1e5407096b0d9b4c1997af2d5ec1a253dbe23b65722a76efea1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to lure users to external sites, potentially for phishing or further malware downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9921

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 https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8e3b881e8bf5b5686d3d9e49f8192978/gukuvufixusuduzaxo.pdf In PDF document text
- https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/u088skg6rt5ioaku80g9ttsbg1/75607985305.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a4261d0d---29966656119.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db64ef07a3---tifujum.pdfIn PDF document text
- http://matsonconstruction.net/userfiles/file/36444449659.pdfIn PDF document text
- http://gdlianyu.com/uploadfiles/file/ziwoxivevuvoludafebimo.pdfIn PDF document text
- https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8af897fec7ed64e5f92b0fcfda834afe/vufir.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7eada244---27378430413.pdfIn PDF document text
- https://sluganarodu.org/userfiles/files/doreb.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e40b78b301e244df536a39f48620644e/83769760471.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f6f86835e---96954371737.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/91dc9geqakih8aulft1q5mqpgk/5066697708.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b36536592f6---52134995997.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078efe5c8d4e---fojojuziwo.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e15a448b2cbaea114611f475d4d0f04b/beluvajorezuv.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160709d49dc360---najorepagobatu.pdfIn PDF document text
- https://arerp.kr/data/file///77685103459.pdfIn PDF document text
- https://ksuskalology.com/images/file/jixiged.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080afecc399a---sekapugofizojidafabo.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/39b7dd9e14de1cc56d7a74c9d49dc250/febebi.pdfIn PDF document text
- https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a244be6a170---93786707237.pdfIn PDF document text
- https://schilderlesvakantie.nl/ckfinder/userfiles/files/tofuligelosinotafemeji.pdfIn PDF document text
- https://allcreaturesinc.com/files/files/lewiga.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f4eb8a283---kewezib.pdfIn PDF document text
- http://allnatureint.com/userfiles/file/97488403685.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=12+rules+for+life+an+antidote+to+chaos+downloadPDF 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_off000144fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x144FC	10832 bytes
SHA-256: `fa1bb7275b6d02ce5384115b9691419c11f6206a40880baf5caa51f9b4a9411f`
`font_01_sfnt_off00015e10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15E10	17880 bytes
SHA-256: `85faf093616957c488b07347eff14730ef55bb53f99150931f8a5c784636ed62`
`font_02_sfnt_off00018cdf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18CDF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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