PDF malware analysis — malicious · 9e51a2fabd8d10d7

MALICIOUS

PDF

89.3 KB Created: 2021-08-06 03:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 0e11cbc6894dfb8139200808f0ffef62 SHA-1: 6cec98e01b2e4b1b28e73dec1fcda0c9bb7cc38c SHA-256: 9e51a2fabd8d10d7cfefb2578da88ab842a6568dd11c2da2be9c8815c2ed74fe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms points towards a phishing or credential harvesting attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/uplcv?utm_term=libros+de+texto+para+aprender+italiano+pdf PDF link annotation
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2bbc4ad1c---54961631162.pdfIn PDF document text
- https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6f1484253b9a463de4e72dbba8d10057/mowebutupuwifi.pdfIn PDF document text
- http://kowel.com/ckfinder/userfiles/files/1623185565.pdfIn PDF document text
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/qqdtrtdvtve42622dfo8iidcb3/22093532459.pdfIn PDF document text
- http://urbanconstructions.org/images/uploadedimages/file/dovanaxitulenux.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c9401e00---56370352081.pdfIn PDF document text
- https://ooo-kenk.ru/userfiles/file/45845931533.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a59517c01c249e514169b700d5c080a6/madiwokabinofeka.pdfIn PDF document text
- https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/65df8a570df592d94f37fc426320eb7a/gemuvoxawebukokaxuvusopi.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/30db7fd9d0a2f84578e1c3e465d34652/75025601460.pdfIn PDF document text
- http://heorungminhphat.com/luutru/files/70036602253.pdfIn PDF document text
- http://orosweb.hu/ckfinder/userfiles/files/fajutigapowesasir.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2d94a096d---74334515655.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/cfed0a60dd8ffc3cf5aeea3da4a2f012/tisalexusa.pdfIn PDF document text
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/p6n09aq03jk5j9flfdvsnneic4/87003863712.pdfIn PDF document text
- https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/692d2c6c1110d2a7a547d3d2f6951588/7298386844.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9em1hjdriiv0jmvh3h84qt6c32/sekaranip.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c4d61e5d5---58222554594.pdfIn PDF document text
- http://iproperty.ae/userfiles/file/75334361302.pdfIn PDF document text
- http://vladjurnalist.ru/archive/file/kaneduda.pdfIn PDF document text
- https://maisonforville.be/documents/file/lizuvolor.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/697e4db594a7ae6447ef88af39262d76/kinizum.pdfIn PDF document text
- http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/firurufudaravaruw.pdfIn PDF document text
- http://centralgiving.com/media/userfiles/file/83665616352.pdfIn PDF document text
- http://ucinnovation.ru/admin/ckfinder/userfiles/files/bewifomotiwejasijasu.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_off0000f623.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF623	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010e3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E3A	10688 bytes
SHA-256: `c350fb92ab835994af51165df9020a7aacd4655822d316c7071c5871f5512948`
`font_02_sfnt_off000126a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126A4	18516 bytes
SHA-256: `34e147da2cb66f0fa56e7986787297dca29b1d3f116b91a1f79f51be61245553`

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