PDF malware analysis — malicious · d24c8612e1b4e989

MALICIOUS

PDF

77.8 KB Created: 2021-06-30 11:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 1d47580da83902ece4a1590d7afff8e5 SHA-1: 4a609b2521c644dea5b80a8d3ac9059848e75cfd SHA-256: d24c8612e1b4e9890f73557f27d10711addbcc0d184ef9bec0df1d2aa5dccae3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external links, many pointing to compromised WordPress sites and disposable domains, suggest a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further indicating a malicious intent rather than legitimate document content.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://laborke.ru/uplcv?utm_term=lange+diagnosis+and+treatment PDF link annotation
- https://n-zvuk.ru/upload/file/bagotuwibemobirurewogimut.pdfIn PDF document text
- https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f43eae465c---80152074491.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8437d8cee---93998439352.pdfIn PDF document text
- http://yearbookplus.com/uploads/ckfinder/files/zipuwireborel.pdfIn PDF document text
- https://farmstead.tw/farmstead/upload/files/28707450754.pdfIn PDF document text
- https://smartcirclegroup.com/userfiles/file/tomisupopijutileviro.pdfIn PDF document text
- https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/576dfb239d59afe27984be46d422ebd9/88305958797.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f202650661---99306846267.pdfIn PDF document text
- https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/5epvl9cq5b2igdfkajt2s3dlpl/35761575799.pdfIn PDF document text
- https://www.alapan.org/fckimages/file/xovipupotaxibunamunebovaf.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab405701f74---96185430689.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a31bdcea84f---52721722911.pdfIn PDF document text
- http://mpu-beratung-brendle.de/userfiles/file/74858675569.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9fb9691d---fomosamipepofuwavigedopi.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160948d491b070---fipaxikinen.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad957b458---9523052566.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/msfp9rbhstqru6ol2i4pmhcqa2/41533736625.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a8e636e48b10f22a92b58e137a6897db/lodiwemufikapo.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/lq1q0oga93qi29eakg1kgpno7q/79659449734.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc85ad30a5---9252025871.pdfIn PDF document text
- http://wooshin.kr/uploaded/file/162216047960a54f34ad326.pdfIn PDF document text
- https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c1c19d2a0---71618642029.pdfIn PDF document text
- http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d1079af2ed3cf6515eef6c308747df9b/72863073182.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd70e4a5f---ramelugukozile.pdfIn PDF document text
- http://metrokentakifinan.com/resimler/files/zuxilupaxexabaw.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_off0000cf5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF5D	10504 bytes
SHA-256: `69272ed8217cb1ed90c80de8f8b5abeaca149c0dac258bc80d87871280878cb5`
`font_01_sfnt_off0000e70c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE70C	16472 bytes
SHA-256: `5d5a3151feabbd6928926fd82a48b8eafeda0959339149afcb68e050b42c3369`
`font_02_sfnt_off000111a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111A7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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