PDF malware analysis — malicious · a86642fe026bd150

MALICIOUS

PDF

95.0 KB Created: 2021-06-26 22:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: bdf16e9c51f9369f57c5e92684fc923c SHA-1: 2a2ff9103844e4985fecf8ed7129b7d906f776c6 SHA-256: a86642fe026bd150bb0fec094b66e38971b7cbce1af2ccc506b2a134f95bac4e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress upload directories. The presence of multiple external links and the detection by security tools suggest an intent to lead users to phishing sites or download malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9918

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://crysiq.ru/uplcv?utm_term=what+room+should+a+grandfather+clock+go+in PDF link annotation
- http://accronline.com/userfiles/file/7634234461.pdfIn PDF document text
- http://yuanyoujie.vip/userfiles/file/zaboliwosenovolepom.pdfIn PDF document text
- https://fcksa.com/ckfinder/userfiles/files/tivasi.pdfIn PDF document text
- http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/6lcgbgi671hmbd2m13e1v24qo2/69805974367.pdfIn PDF document text
- https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0k9d1m19upothura5jvp1mqifd/13820182142.pdfIn PDF document text
- http://vipnjl.com/userfiles/files/90042432824.pdfIn PDF document text
- https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/t1ifsnqki62uop70l6kv2ldmt4/12754870667.pdfIn PDF document text
- http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/bonexagal.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e665acf724cf509259abc611c962008/pugotutomijazotinirorupa.pdfIn PDF document text
- http://bagiez.de/userfiles/file/rosusipoxes.pdfIn PDF document text
- http://ketnoikienthuc.com/upload/files/golewozolizizijazito.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c334133571b---74630301580.pdfIn PDF document text
- https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qcoq3paer0sfbebl3evqku3ver/vujoxosugadunajo.pdfIn PDF document text
- https://kaptenhoki.info/contents//files/zanasuvarijenu.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa66412cd---33996183412.pdfIn PDF document text
- https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160786a1d12680---wujapiro.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5e478c62---77846696383.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993f739d2bc---11230730707.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/tein3n7i7ahgciahh3gg6jb5fk/29474293411.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/22b24b605cdab898f8e57c457a66c5e6/befigiwa.pdfIn PDF document text
- http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a523d1d94a---79425960660.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/sokakewaladini.pdfIn PDF document text
- https://5uempat.com/contents//files/88166913434.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081752da7434---17108100227.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54fb90cb6---kokasugafe.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00013aa8.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x13AA8	17980 bytes
SHA-256: `91a934bcd71af411c844821610a949d9d4a1a3c3458f7de6a99d37aa060cbc7e`
`font_00_sfnt_off0000f49b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF49B	17152 bytes
SHA-256: `e9124be4604665666845494f336a2b5fe03818d427e1c0668d157b274f66a24a`
`font_01_sfnt_off0001211a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1211A	11108 bytes
SHA-256: `62cd94a464562ae9c60d19f6fffa3f4c6bfbcffe5aee7101c31851568ce55c23`
`font_03_sfnt_off000156f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x156F9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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