PDF malware analysis — malicious · 086168bc5a98e6ae

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 18:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f05a9efce89543392dcae3aa6c000fa7 SHA-1: 4f0ea316636d7959ff9a01303e56fa2de1f19f2c SHA-256: 086168bc5a98e6aedb8fc3b2158ea75f6a1831ca5b53e98564a28be765649695

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards a tactic of redirecting users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9783

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://karthikeyanjayaram.com/userfiles/file/79706184460.pdf In PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/59011c6360f6e0989bb8b9f5ef42b0c9/ginezuzugowuzaxumebagexi.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7ea3549511b34cf1c33af9ec84452f6f/4782864037.pdfIn PDF document text
- https://condicionamentofisico.com/arquivos/file/noporibukupilezasotigik.pdfIn PDF document text
- https://bruceautoservice.com/files/file/refolezun.pdfIn PDF document text
- http://theheavent.com/userfiles/files/wojizewutipagekidalemodar.pdfIn PDF document text
- https://aihr-iadh.org/uploads/FCK_files/file/wikelo.pdfIn PDF document text
- https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/deb9ks3k6qqjv07qdibfe7ujvj/nurofesatoniza.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/aae1c844cc2df6680cc2ba249004e685/53889749789.pdfIn PDF document text
- http://dpsszczytno.pl/photo/file/79680344979.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d48e73d08f5f209a22dcb940ce3f6446/busud.pdfIn PDF document text
- https://ildiko-szepsegszalon.hu/userfiles/file/7606700056.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/khii045p9tmgvqrclqf9uo47oq/zudagixiniwada.pdfIn PDF document text
- https://crownprolaw.com/userfiles/Proj_Name/files/jatok.pdfIn PDF document text
- http://jandenzobv.com/image_uploads/file/53461072035.pdfIn PDF document text
- https://fiscalonline.eu/app/webroot/files/userfiles/files/55697450095.pdfIn PDF document text
- https://cakenflowersonline.com/userfiles/file/48500989678.pdfIn PDF document text
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dda0a872e---tozaniwepuzezipagitusesun.pdfIn PDF document text
- https://hondamienbac.vn/userfiles/file/wejatojujusewenugiliw.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee27f009c7e---37220811308.pdfIn PDF document text
- http://sciattella.net/images/file/4466978093.pdfIn PDF document text
- https://sindonis.com/userfiles/file/tavakaxajogofepawe.pdfIn PDF document text
- https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/agdok3j7ihmkvsri17nnblt83l/11121490410.pdfIn PDF document text
- http://ccsl.asia/files/41988342755.pdfIn PDF document text
- http://chrislahoda.ca/userfiles/file/93721076328.pdfIn PDF document text
- http://bobiniauto.com/userfiles/file/pafodusixuladokoxuwulixip.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=object+oriented+programming+concepts+in+java+with+examples+pdfPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c65f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC65F	17636 bytes
SHA-256: `bbe695924f943720e651ec9561528b65d6a1e4aab90191e61d67517d9fe2a171`
`font_01_sfnt_off0000e132.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE132	16816 bytes
SHA-256: `b00bc79eb4a4007f2955ffcc4271e24713c2bda95b99681b469ae2bda5e51feb`
`font_02_sfnt_off00010cc3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CC3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000124da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124DA	11616 bytes
SHA-256: `2f5cb947a89dce87935227097b8ff26469ac947ddb884269001ac0fd476d09b5`

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