PDF malware analysis — malicious · e4070b2046b3cb8e

MALICIOUS

PDF

91.1 KB Created: 2021-06-28 09:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 8dcecba862c96eef5bb327e1f343b9e9 SHA-1: 3760cccca3b23d5639d566f6208ab376b2c2cb7f SHA-256: e4070b2046b3cb8e49cf66ca5980b3aa08a7456520cc69774188cd1181ea3062

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely to redirect users to phishing pages or download further malware. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest this document's primary purpose is to facilitate malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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 https://nomylo.ru/uplcv?utm_term=ps+cc+2020+android PDF link annotation
- http://gopherandsquirrelcontrol.com/admin/images/file/doxezowofoxabuperux.pdfIn PDF document text
- http://akinmedical.com/uploads/file/fijibezutibunenip.pdfIn PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c19a2cdd---16617975285.pdfIn PDF document text
- https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082baf60b0d1---9084970317.pdfIn PDF document text
- https://mertlakustika.cz/images/pages/file/31145972413.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86bfb13bb---42821365416.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/eiqshb9h77af2qejnal09l9srl/kelabojerulad.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e73b73893---vumesafozutakogugolag.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607235574fde1---nedelezadowasekalowulemer.pdfIn PDF document text
- https://akapacha.com/userfiles/file/34212406119.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ed5576df3---61967959340.pdfIn PDF document text
- https://shiokerbau1.com/contents//files/9400080665.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/710aedb88a3f74bb7060cc4bd68cd800/25386794967.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f7acac6b---jakikox.pdfIn PDF document text
- http://onlinetradeshow.ir/uploads/files/rediromuf.pdfIn PDF document text
- https://n-zvuk.ru/upload/file/71131177844.pdfIn PDF document text
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/309fdmnvd2efvsirnrdtifqgi5/malonevetizizawepom.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b982765f5---20473330932.pdfIn PDF document text
- http://tubietelbar.hu/uploadfile/33925358756.pdfIn PDF document text
- http://www.urbanwaterways.info/files/witozurowogufe.pdfIn PDF document text
- http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/23125542214.pdfIn PDF document text
- http://digifast.cz/userfiles/gigojajudegigun.pdfIn PDF document text
- http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/86497300222.pdfIn PDF document text
- https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/cd905e0d6c7f5500d8cda982871879d9/87903792237.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e7ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7EC	10328 bytes
SHA-256: `d53e6e068a180ad7725dddd4988961b1a6ad219c7f219eaaa74538367faba4bf`
`font_01_sfnt_off0000ff5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF5E	19264 bytes
SHA-256: `40a535cfba5f7bb1435f60610437cfa1f014a3527f1e2e8dcd578b487dd301bf`
`font_02_sfnt_off00012f7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F7E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001478f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1478F	16208 bytes
SHA-256: `4602efdc27effd6d0b9796dd62a14020f6514d216ceac1da6ee579af8a0da4e5`

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