PDF malware analysis — malicious · 4f9b63c8990e2758

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 02:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 32b7c3bf3beb7e396e2fe9a87c67f0ce SHA-1: 33e39cf4a3bca1b17a9e57cd6c6560e8339a466b SHA-256: 4f9b63c8990e2758fbf6a97ceada45768211bc2a5b56ebb8282ab7b4fb2290b8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=nimrod+meaning+bible PDF link annotation
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e489494387a4c146031041a6c53221b9/90641882992.pdfIn PDF document text
- http://rilta.net/userfiles/files/82591017237.pdfIn PDF document text
- https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/04d99d11819f5fef86e24a49ab936510/85892455244.pdfIn PDF document text
- http://aelma.com/sites/default/userfiles/file/kujevaburijulegavozawi.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/47194020974.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607929ca4c581---winipeviredewoteli.pdfIn PDF document text
- https://atamergranit.com/userfiles/file/pijaliwarorum.pdfIn PDF document text
- http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30141091817.pdfIn PDF document text
- http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f04e1d73---popav.pdfIn PDF document text
- http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e888b11a8---jemape.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/0c8eaf4f82c94a4d24e2b16688578c49/nutomogitoru.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d01e164f---zabonevutakenibigevumovi.pdfIn PDF document text
- http://adria-ex.com/images/blog//file/libuvozi.pdfIn PDF document text
- http://classicalgardenstatues.com/uplds/file/36778555492.pdfIn PDF document text
- http://cameralehiep.com/hinhanh_fckeditor/file/wekopepipojaxurituvaba.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2co5bn0jnjq9nnqtjlnsrvmsfa/pebujivolufe.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fdd1679fa---kavudumagivufe.pdfIn PDF document text
- http://dolphinkorea.com/files/files/buboduwufazopasuvonezu.pdfIn PDF document text
- http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd5274ab2a---12453339550.pdfIn PDF document text
- http://www.rify.us/cms-uploads/files/pirizefiwojifaka.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4t5shcm31evrfjhnn6jhr6tgml/18056479469.pdfIn PDF document text
- https://rachelrom.com/rescontent/file/70308442314.pdfIn PDF document text
- http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eab44b4a3---12208203644.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/2hae9omnbbq6k5amkkvbnqma74/lepotuzasotalexixo.pdfIn PDF document text
- https://alate.org/admin/fckeditor/editorfile/ninawubu.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_off0000f2ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2AE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010ac5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AC5	10444 bytes
SHA-256: `7924d52d615971a3d88e4000f5691b1ebd1dc8682581e5474c4a3fd0660bb865`
`font_02_sfnt_off00012218.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12218	17628 bytes
SHA-256: `2ef8ab7e3b2c16f99237cdafd711015cca8e654136826bda8e83f829eb01dce7`

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