PDF malware analysis — malicious · d523c33f20fb9a0d

MALICIOUS

PDF

86.9 KB Created: 2021-08-01 11:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 758256d2fe5fc507bdf0b5705f2970e7 SHA-1: 93611e1aebde77e39cf1fbc1ab188b27335e0336 SHA-256: d523c33f20fb9a0dd23823a08377715e19e83d9f7ae306cde2f7adfe821b1450

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple distinct hosts and a high number of links per host further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607999f3e5b7d---gepabona.pdf In PDF document text
- https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/bcda8aaaed0a41c150b55151e27679d3/fejezisamivuzonapasawabas.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7d730p4hin26qll686b6gh2351/jizujesezojuzufatunile.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/eb0e405bd6e32e4a46293040643dffb9/51671862483.pdfIn PDF document text
- https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1062a814b---99754037689.pdfIn PDF document text
- http://woodwork.pl/ubezpiecz/obrazy/file/11801051511.pdfIn PDF document text
- https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/d7if9d2v43ul004iivm9t4r60h/55065561154.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828ee6c9798---wuzanowinexilen.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a177b5db445---73786335850.pdfIn PDF document text
- https://getadoc.in/ckfinder/userfiles/files/pibezabawogibibij.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160891a96c8e7d---kudutegetox.pdfIn PDF document text
- http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/nipuworasejodetofe.pdfIn PDF document text
- https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2810d19f96d3d5971bb3dcf2ccde1f4a/98248781748.pdfIn PDF document text
- http://gsemilia.it/userfiles/files/61348160491.pdfIn PDF document text
- https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6e17129425ee6c6733dcd948a4087d3e/88516349819.pdfIn PDF document text
- http://dentalclinicbangalore.com/uploads/rukemezanonigufu.pdfIn PDF document text
- http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090c2e63602e---36359741208.pdfIn PDF document text
- https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/cfcsid6cb52ns7rf24h4nkgao4/76318329036.pdfIn PDF document text
- https://mamo-tato.ro/userfiles/file/kopofalanilaxixeganexo.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cs4vhr4agctg86g6qh4f80i5s6/43132748029.pdfIn PDF document text
- https://sharadsangam.org/UserFilesTwo/file/vuvepi.pdfIn PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082da4fe8117---69992100893.pdfIn PDF document text
- https://zbmbudomont.pl/userfiles/file/mopizigawunutametebupoxiz.pdfIn PDF document text
- https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/luloweti.pdfIn PDF document text
- http://opakowania-loga.pl/zdjecia/fotki/file/zobafet.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02c14d66c6---kufajinavikaxasuro.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=descargar+pokemon+x+para+game+boy+advance+en+espa%C3%B1olPDF 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_off0000e843.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE843	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001005a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1005A	11388 bytes
SHA-256: `4eee66bfaeb37e470e93d344a67e4c62dbe167b2097ed28c81f2050f257006b4`
`font_02_sfnt_off00011a94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A94	18608 bytes
SHA-256: `face33506a01fea5da4c249c16f41e7b7017fe26d80fcb0c11fc3a8c2a37ffbc`

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