PDF malware analysis — malicious · 3900e7f65e4c8589

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 03:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 49f8e72f5ed8d602685c88a11672115f SHA-1: 799289956f350e19456096ccc6bea7033be2d683 SHA-256: 3900e7f65e4c85896de21dab786e4a4092f23462e37f7591d4602769c4a63c54

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.001 Process Injection

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for distributing malicious content or phishing lures. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4557ae89ea9f1ae244c538de6d4fd147/rajipusudibod.pdf In PDF document text
- http://refpecsbelvaros.hu/kepek/files/vakazaraxoruroxubosox.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ba73f68d---13352685397.pdfIn PDF document text
- http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e48be9efd18---fatitedoxaxegoko.pdfIn PDF document text
- http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/nowujabulatob.pdfIn PDF document text
- https://pet-fashion.ro/mm/file/logemezekawufoganolak.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbce7c6ea---84540713090.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8315cc551e6ca51aef89348f584ab32a/wakelofidipufagulofawumin.pdfIn PDF document text
- http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da90792536---11266480783.pdfIn PDF document text
- https://pametnidom.hr/pametne_kuce/userfiles/file/71950738586.pdfIn PDF document text
- https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o328toa0qhdib3ldbg559qq218/52938942162.pdfIn PDF document text
- http://africanhairbraidingsalon.com/userfiles/file/gobejilebokogogiz.pdfIn PDF document text
- http://www.masozilina.sk/ckfinder/userfiles/files/guxobutimadolezefub.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612de10066ab3---93304636218.pdfIn PDF document text
- http://doudou.tw/userfiles/files/wuvomujonuxenujowipagili.pdfIn PDF document text
- http://kristenpell.com/userfiles/files/85235517460.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b50e6201f---wivofolunedawudalabinaz.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610112df1b93e---rudemibeg.pdfIn PDF document text
- http://www.firengo.com/userfiles/files/82997313236.pdfIn PDF document text
- https://mmgrowersg.com/ckfinder/userfiles/files/13037638898.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/sb4qqf3a627f3nireei1tl58b0/11341172292.pdfIn PDF document text
- http://falerisztika.hu/tmp/xunusugem.pdfIn PDF document text
- http://nakatka.com/files/file/42050401300.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/9215d4bc534b8123c13d5d22daefa550/pokadabixupidolatokafipux.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/19d15ca84184a704d38d79c2e9205011/13270272987.pdfIn PDF document text
- http://urduhadith.org/survey/userfiles/files/xegikade.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=negative+connotation+in+a+sentencePDF 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_off0000e7ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7EE	18364 bytes
SHA-256: `4b6eae34cf0b69a1cead94ba3d85a7833dc81d9be34e1874498d0985b0824f1d`
`font_01_sfnt_off00011725.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11725	10300 bytes
SHA-256: `ac0aa686f4b8f244489851ee8c4004bbb5cbe32149f228caa9b9133e146914d8`
`font_02_sfnt_off00012e91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E91	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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