PDF malware analysis — malicious · bb14b4cf4fb1768a

MALICIOUS

PDF

89.0 KB Created: 2021-06-25 19:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: d877ca6b84cda85bc667be31937da029 SHA-1: 19ed29a61e2e54188762837ce90b448b57084aea SHA-256: bb14b4cf4fb1768a9a36b7e4f09aef8c643fec2cb327701fc84fcaaccfed225b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=introduction+to+chemical+engineering+analysis+russell+pdf PDF link annotation
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee8861b29---87949216415.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad341cf62---40887915685.pdfIn PDF document text
- https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/1gs8crg86493qnslsbs2ab1one/berotesapejinezedipifexi.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073031e750c1---2204672227.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160784d1f374d3---vakiguduluzajus.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919eb437758---95582081566.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01f5ac91f---40736374120.pdfIn PDF document text
- http://hagelkonzept.de/userfiles/file/83524478175.pdfIn PDF document text
- http://varanini.pl/userfiles/file/50665443969.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3f9352695---4276000688.pdfIn PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/808d881ca876317761c9b1a9332eea6a/23689668958.pdfIn PDF document text
- http://baohanhranghm.com/upload/img/files/9293358866.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a508792f4a4---magosufa.pdfIn PDF document text
- https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/a57b9378209691b184610b320edd6cce/17319483129.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ddca3036c---11483857393.pdfIn PDF document text
- http://armanetti.com/images/savasotasakanozawaduso.pdfIn PDF document text
- https://limblength-sldf.com/userfiles/file/12780290765.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4328b2f3f699ae9eb906d1a43e90d367/93397467407.pdfIn PDF document text
- https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607555329d5b4---54462246981.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6b0155a1---noxuxejijojup.pdfIn PDF document text
- https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3acbe87500---sudepukaletipoxi.pdfIn PDF document text
- http://aylincinarli.com/fckfiles/file/87190253157.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16f17f720---82931220093.pdfIn PDF document text
- https://pjkconstruction.ca/images/file/79109505539.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc262bef74---91611671247.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_off0000f24e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF24E	18136 bytes
SHA-256: `6247a1b3d07d89fb973238ffd8b8538f41860d8e4157f50d15dc2992bf98bcf7`
`font_01_sfnt_off000121fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121FC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013a13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A13	11232 bytes
SHA-256: `31fcd36ff3d2691d90da2d6fbcd306e044b6aaa2885d5b7fc4b6690d8df1943a`

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