PDF malware analysis — malicious · 9b6c9e21f7bb8159

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 02:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b56ac2fa51e948cf29eff2cfc5d056f9 SHA-1: 1c0a3396f6b05cf250971d33b141ec52c0fd4788 SHA-256: 9b6c9e21f7bb8159de421a959266d05bb4d3e8edd31be47818d20c6d5eaeffb0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for redirection or exploitation, hence the inclusion of T1059.007.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=true+life+crime+watch+online PDF link annotation
- http://swiftnb.com/ckfinder/userfiles/files/22360867160.pdfIn PDF document text
- https://torbay.ru/images/uploads/file/85184663159.pdfIn PDF document text
- http://kjphotocon.org/data/userfiles/files/venulekid.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130b73e1954c---lupojavedidoge.pdfIn PDF document text
- https://boyanbolyarski.com/userfiles/file/35654765380.pdfIn PDF document text
- http://www.macrolepidoptera.hu/userfiles/files/fesobobijigojuxewij.pdfIn PDF document text
- http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/fipojovivujilegivubil.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e77a5ef31---visizokuturokuv.pdfIn PDF document text
- http://anduong-nhatthanh.com/uploads/news_file/49736942607.pdfIn PDF document text
- https://99shayari.in/userfiles/files/ranov.pdfIn PDF document text
- http://unite-chem.cn/upload/files/linijumerijixo.pdfIn PDF document text
- https://jnnjhansi.com/userfiles/file/27648037152.pdfIn PDF document text
- http://guchen.ru/d/files/57689555417.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e5aup91fbebjn75rg5kva36l6/dagovej.pdfIn PDF document text
- http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/151714413561.pdfIn PDF document text
- http://redondoclassicburger.com/uploads/files/57025041521.pdfIn PDF document text
- https://bangprice.com/bangprice.com/beta/cms_image/file/46280357365.pdfIn PDF document text
- https://aramlasmerok.hu/uploads/file/5221398162.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3b633423d7f0fcc0268001dae8e60a41/59758300846.pdfIn PDF document text
- http://hypotekaprezamestnancov.sk/res/file/xavinebek.pdfIn PDF document text
- http://jingyitech.com/uploadfile/39862556730.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b29089fc---xodatupuvezuluwalut.pdfIn PDF document text
- http://gesundezellen.de/neu/userfiles/file/lobebufevilubuvopo.pdfIn PDF document text
- http://nikolalepojevic5.com/multimedia/file/79988637727.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_off0000dbe8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBE8	10580 bytes
SHA-256: `f5e14fc91eafcfad4ffcc92795884b99bcbff4a3baa4ae221d8553d215310c34`
`font_01_sfnt_off0000f3eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3EB	17600 bytes
SHA-256: `09d448411b25b73efbd2f6eb2e98e4ecb6f5c1608338276d717594fc2b8c7ee2`
`font_02_sfnt_off0001222f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1222F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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