PDF malware analysis — malicious · 4cf04c35d7fe9e08

MALICIOUS

PDF

78.0 KB Created: 2021-07-13 22:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: af4216bf4fab82a921b936e7a7cd78a5 SHA-1: 57d2e98f2c996a14a1210ce33c0c330eb3888497 SHA-256: 4cf04c35d7fe9e08b6bd43b1094b44da832c871a8eab92e4c94a775d5a451018

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal that the document functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. These links are likely intended for phishing or to serve as a distribution point for further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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=already+just+yet+ever+never PDF link annotation
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc650a78d---kolekewema.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895b9d2352a---25381140615.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608869ebb8b34---joxezokobor.pdfIn PDF document text
- http://boxerdapolenta.com/cmsimple/images/file/waneb.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d52dff9c---41769337134.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160701cc7c8e55---dejarelipum.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfb56767b---moxatogakamurapev.pdfIn PDF document text
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ddii61mib039epcidhn2o7n5v4/xasarukaninudutabenul.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f4b5bf87b6053d883848766469910d40/nakuzilidagajusefereporo.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160902b069c916---jelafapuwa.pdfIn PDF document text
- https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ts0cbctc89ldcq8ojbcpft805t/24521680855.pdfIn PDF document text
- http://emeat.ru/var/files/jodejevipefafaku.pdfIn PDF document text
- http://tutaylamhet.com/storage/ckfinder/files/26064634341.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8e6c6c0d4c341c44c62a1fd11a2dbd99/satipupevubel.pdfIn PDF document text
- https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/1mihbjhv08323do7j4kp6kfcea/roguweniputali.pdfIn PDF document text
- http://teifsepahan.com/files/file/wufapolilevef.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lmm9doqc7vekr58bt8ssi5hmmf/98591629339.pdfIn PDF document text
- https://ijpdua.com/contents//files/35807063476.pdfIn PDF document text
- http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c28a4bf1a90cdb687feb6254e3a328b3/wugabonutukekutuxerixa.pdfIn PDF document text
- http://galgalesh.com/userfiles/file/16429339975.pdfIn PDF document text
- http://russkiivopros.com/images/FCKeditor/file/30083948867.pdfIn PDF document text
- https://vasantviharproperties.com/userfiles/file/44940158699.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094344068aec---23356351156.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfd0cce2d4---tuworudegoj.pdfIn PDF document text
- http://janandpoos.com/clients/872640/File/97969840099.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_off0000cbfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBFC	10420 bytes
SHA-256: `1e9858028ff35fa7fb8035dfe378bec8e0461cbce03a22945ea48a6e5e9f1e92`
`font_01_sfnt_off0000e3c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3C3	18348 bytes
SHA-256: `b1d2fea6184a653b06e87912df9e2aaace4d078f50e3a1a33c0086a2a82fa2fe`
`font_02_sfnt_off000112b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112B0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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