PDF malware analysis — malicious · fb6b51e1061c4476

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 17:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 778343ad545c2b288230e614a8521c39 SHA-1: 1eddcab3ecc212da484e8a8669fd711b337461f7 SHA-256: fb6b51e1061c44764bed44f5677de8f726f5563ceb34dd77977dd6172922c6ee

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting domains. The embedded URLs and link farm structure suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=ejercicios+rotacismo+pdf PDF link annotation
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/95d4f88911db04843cf408f9bc6d32d0/85967521267.pdfIn PDF document text
- https://jdlpartnerss.com/userfiles/file/vakepujupanebivimegus.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8btqdre7qae3u9o8htu79di5lb/mewuge.pdfIn PDF document text
- http://77owship.netsociality.com/upload/files/9911220374.pdfIn PDF document text
- http://www.ecvbrass.ch/user/web/file/73571038431.pdfIn PDF document text
- https://bakotech.at/uploads/ckeditor/files/zaweberudijam.pdfIn PDF document text
- https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1ef59c80dc4c0708b17a5ea27e6d357a/bazumexetizex.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074adb503768---71584880420.pdfIn PDF document text
- http://ville-dammarie.com/ckfinder/userfiles/files/welegevidetazetof.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05b084993---3315132724.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b69e01ba---nuwibepuvidezoro.pdfIn PDF document text
- http://af.ssla.ru/images/fornews/files/wototumun.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608064d534974---vunabusapatofirolesax.pdfIn PDF document text
- https://marlin-aquarium.ru/ckfinder/userfiles/files/tegalu.pdfIn PDF document text
- https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/icp217s3tebs1nt26jsaobi3m7/40115933178.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb9ba1e00a---2430606561.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6085345439---rakoxezogupisuset.pdfIn PDF document text
- https://madeinstlucia.com/userfiles/files/bexun.pdfIn PDF document text
- https://ultralloy.net/upload/files/33779079078.pdfIn PDF document text
- http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/88440255123.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c017d77d99f---mopokemezegidibetaviwer.pdfIn PDF document text
- https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/c0d1520e661e87c1cd7f6b3f53129a58/viwejimovefagitidajezuxaj.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/07027ce6cbed64dcdad281a2369da96b/25214694044.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c1bcdb353376f2307bd48681e84860b/jumubumu.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_off0000ee6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE6B	10744 bytes
SHA-256: `71bcf61d1de831dbdb80e52f6c0e3d8f69cab6c2dc2c00258bafd66ea8ec210d`
`font_01_sfnt_off0001071e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1071E	19120 bytes
SHA-256: `183402114636fe6a30a78192aa8877c802cb6ea4e3df360f9c7b6001aa13a62d`
`font_02_sfnt_off0001382f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1382F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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