PDF malware analysis — malicious · 1ecebf2c911e5d77

MALICIOUS

PDF

81.6 KB Created: 2021-08-15 06:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 30f269d4a7629f8eed38cc76275132be SHA-1: 9f41f97d231bff8824ba8399b40fb7662072b2d8 SHA-256: 1ecebf2c911e5d77c16069ce4f600fd01f2c3efd11c1ede32dec67444a0937e9

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL

PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
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://pixomot.ru/uplcv?utm_term=subject+object+complement+worksheet PDF link annotation
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160de8d87346c4---38159348427.pdfIn PDF document text
- https://kraftyz.in/ckfinder/userfiles/files/22559215186.pdfIn PDF document text
- http://secretinvitation.net/images/files/zanebibakoxiv.pdfIn PDF document text
- https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/73a45d1349ee1ff964db6bd82819d49b/78784146547.pdfIn PDF document text
- http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16093270a9f093---3095979598.pdfPDF link annotation
- http://podhoru.cz/userfiles/file/guparulalopejudaxogepote.pdfIn PDF document text
- http://austria-ex.com/images/blog//file/bofegejejudoxisugexupexi.pdfIn PDF document text
- http://ledseoul.com/userData/board/file/4195950653.pdfIn PDF document text
- http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/memipotusenefomulalo.pdfIn PDF document text
- http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d64209ac704---34463891234.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9821ca8a7a---jalozowizelisagilanegijab.pdfIn PDF document text
- https://mayxaydunghoangphuc.com/userfiles/files/xoxobozomuguwowu.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3154662f6---nabezibone.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/41f83f01104e890feb7b1c0a0dc5798b/27680564744.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a393ca0e490---jurajalopaji.pdfIn PDF document text
- https://cengilli.com/icerik_images/file/78452303910.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfef3a0deff---20208522046.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7ebpudmutni8m86qif1ebrv704/dugoresosewo.pdfIn PDF document text
- http://debeleven.net/UserFiles/File/daludixibobupuw.pdfIn PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/090629ccd8dd401010b08a1dc1d13ecd/vopigatesabunofasus.pdfIn PDF document text
- https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/efd8cdb04133d04b7eeb8843bf2002d5/vupufevafa.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53r792odk5k40cpgaknmrsrmr7/gidefiwovo.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096a673341a7---zepolijovepa.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160787627054c1---bibegapa.pdfIn PDF document text
- https://castilloexterior.es/ckfinder/userfiles/files/83175946094.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a692a2338---badegufirukokusuret.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_off0000da40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA40	17220 bytes
SHA-256: `63322042714ab3d0b2f749c3c914aee296f239fe02f0b1e0082f8e1ce9c7af8a`
`font_01_sfnt_off0001075e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1075E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011f75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F75	11008 bytes
SHA-256: `b4478b7eb659682fca79a8b5d40862de8775a790c0c68f1f0634b80e48d8a61e`

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