PDF malware analysis — malicious · 28d4c71a4847ae86

MALICIOUS

PDF

96.0 KB Created: 2021-07-04 10:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 52534d8a5913c8fd417da75f7968a8b5 SHA-1: 945ef7a3359a1f1906357998d67d8783239b182b SHA-256: 28d4c71a4847ae865e68b4f71a5654240e45756443fca7f1b7d3c93155bbec2d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The primary attack pattern involves luring users to download further payloads via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

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 http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160746c8457623---fitufofuxudapusul.pdf In PDF document text
- http://www.siposferenc.hu/html/25902357770.pdfIn PDF document text
- http://gabortech.com/admin/file/16497935339.pdfIn PDF document text
- http://alliance-ic.ru/uploads/file/51494223805.pdfIn PDF document text
- https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/7c109bff95b64d7d42b56b772c2983d3/jefiwebus.pdfIn PDF document text
- http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62636855402.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6f4c3457---17139089482.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ulrgcjoq21n0v0u82cdi0h9dd7/40028732386.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b735c197---43221395390.pdfIn PDF document text
- https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/3g45c297vjsqua8qq8fh07i779/86344408875.pdfIn PDF document text
- http://baschin-heizung.com/meineBilderAlbertGrundschule/file/gogupid.pdfIn PDF document text
- http://atenngo.com/admin/sites/site/documents/bimivanafawuzotoxapubi.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/86ae399ae47c84b25d6c956020a23f0a/ledojiganisupimol.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8f8e3c13b---72601358990.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607be11ac17f0---zofonojemawaz.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609428c3510d9---jegen.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f8e8942ce---65361341562.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4b96473ea3fa4df8c3461a2d6faeba00/jikopasiruregaxide.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607df47a3c8d7---nuladonone.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/on6kipo575plgohl61h4l60sg5/tenezepusatijugetanalira.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a3943de775b47b09634b012dad4c7fc9/97672357677.pdfIn PDF document text
- https://sacc-la-chaux-de-fonds.ch/fichiers/file/diwevunulomedit.pdfIn PDF document text
- https://wrd13.com/force/file/tafobarovonopipugonajodu.pdfIn PDF document text
- https://anfauglir.com/images/file/55070707253.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b077ab71d1f---pekevefo.pdfIn PDF document text
- https://cristalensi.com/public/File/41976638723.pdfIn PDF document text
- http://elateridae.com/images/FCKeditor/file/zixagezubekunasu.pdfIn PDF document text
- http://tulga.ru/editor/files/41359809282.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+magic+doodle+godPDF 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_off0000f7ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7CE	10508 bytes
SHA-256: `9742c1fbf6851ef8edbf92ae6ef606726cd808e2cacf6e8ca8c9984afc69f071`
`font_01_sfnt_off00010f86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F86	20760 bytes
SHA-256: `2debb9311b2f84f36745e4aa771f3e9c50e46d5eb6b014e72b68ddfa5710c2e3`
`font_02_sfnt_off0001446f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1446F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00015c80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15C80	16140 bytes
SHA-256: `00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b`

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