PDF malware analysis — malicious · 4c8a2c4a3b1ad72d

MALICIOUS

PDF

87.5 KB Created: 2021-07-08 10:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: e6402e4035bd3c324bc185f1f3540207 SHA-1: 20a389ec4799b68285619be278736efc00a79ade SHA-256: 4c8a2c4a3b1ad72d10224cc849bb5267e73a6be1f599a25022c5205c00a7633a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure indicates a link farm used for malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

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://huntic.ru/uplcv?utm_term=ibis+paint+x+free+download+for+windows+7 PDF link annotation
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084b267cc8a2---99884052944.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e3c2be96---jeziwitijarurodunawaba.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/58d1642fb4f4ab41fcb33a399fc919fa/48077368584.pdfIn PDF document text
- https://tepihtrava.rs//files/diwawukip.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a326a15f469---91705180808.pdfIn PDF document text
- https://spacio.hk/attachment/file/4811354852.pdfIn PDF document text
- http://memphiscentral1969.com/clients/865565/File/4492742593.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9f584a0ded760fa264600acbe980c5fb/92584580405.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607585c229b3f---wefawufolikebodovajodof.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9389b0f0c8---7170378652.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/89fa9b856f21f441133116948d4bf1f0/zusizirugijekonuwiked.pdfIn PDF document text
- http://alnadaoil.com/userfiles/file/71318200448.pdfIn PDF document text
- http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/10295244376.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/fda8a51f11b857bd2a5e7e5de0dd69db/81019644948.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc3b04fbbd---60430330832.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af90c20a83f---sixijodekog.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927c101aae0---domesasili.pdfIn PDF document text
- https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e36049a0dc3aea8110bcdef0e6d3a3b4/japomotewibabexotogoja.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608503dc9a91f---podogefufutijulo.pdfIn PDF document text
- https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1e5790c22a40c2dccc385dce7e6328d6/noponefoxulovedakobubug.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099deffe8a83---vabosige.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/19ac4fffe5b938ba6fde5d937b4bd167/bogirilujavexidofap.pdfIn PDF document text
- http://volkshilfe-vlbg.at/images/content/files/52198767768.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_off0000f448.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF448	16736 bytes
SHA-256: `e7c68265f6d2bdcaf9d61339f62142d4bd98381f548a902d41ef9f0399e60595`
`font_01_sfnt_off00011f92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F92	10820 bytes
SHA-256: `6a2d57ac8a819e7b546acc0f137f8c36dcc43f870c6bd43247b19a401b0bc5de`
`font_02_sfnt_off00013895.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13895	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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