PDF malware analysis — malicious · 5b89f7aea34f5267

MALICIOUS

PDF

91.3 KB Created: 2021-06-28 21:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: fd58e1152b4290a516f4fd95147121cf SHA-1: e63cd3df4a31781a633544de684274422a545d8c SHA-256: 5b89f7aea34f52671506459543af137ace4fa59d8475df5d8495ea2510d3ca86

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, directing users to various URLs hosted on compromised CMS uploads and disposable domains. The primary goal appears to be redirecting users to potentially malicious content or further stages of an attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://personnelcle.com/userfiles/file/6307157107.pdf In PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949dddddaa4---3894403274.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7bbe218af97c48d38017878a17cf1a6d/58353833143.pdfIn PDF document text
- https://atkarisuli.hu/userfiles/file/32953916091.pdfIn PDF document text
- https://bednidhitraders.com/userfiles/file/42816213114.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d021a1f583---rufarabobelabuzaxanisifup.pdfIn PDF document text
- https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/6ac06b54fcc6cbecb19006399777dc6c/govepawaw.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5gjb57gj35uqarkf6gnffk0mvr/64049359517.pdfIn PDF document text
- https://danielstrehlau.com/userfiles/file/rufatudifovite.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/3hool8l23r9bib3mpr5ng17114/25219281967.pdfIn PDF document text
- http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a90d3d6f8---dotupef.pdfIn PDF document text
- https://hyosungulf.com/uploads/file/55622126700.pdfIn PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vggp2n1g87imaif8098qs69qkt/dijadejexixasoredevatilut.pdfIn PDF document text
- http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/35623113612.pdfIn PDF document text
- http://pphu-joanna.pl/fckpliki/file/pipibelotovixijazijumu.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae44ea7d62f---33665308715.pdfIn PDF document text
- https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/bed9k1s585kgnndtr1upr2mc3s/69960875425.pdfIn PDF document text
- http://klubbelgickychobrov.sk/editor_uploads/files/gibekovivereneguxotu.pdfIn PDF document text
- http://vvk-wiedermann.at/userfiles/file/3338562163.pdfIn PDF document text
- http://gibkrakow.pl/uploads/files/jejuxosafanigidovivuxu.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3252e380---zufanowesagopomomibixex.pdfIn PDF document text
- http://alpanelektrik.com/depo/sayfaresim/file/jajulerokavemozam.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3f04c76d4---78326860930.pdfIn PDF document text
- http://eraucheta.ru/uploads/file/wuminerafexekabowes.pdfIn PDF document text
- http://rocincorporated.com/domain.com/images/dynamic_pages/file/87365614978.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16087a86ba2b3d---zunadegakijefadevi.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+uncurse+myselfPDF 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_off0000edc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDC9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105E0	10536 bytes
SHA-256: `804489decc5931251c47365ae4494639669cd5c7b53137599b5521e904293a67`
`font_02_sfnt_off00011df2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DF2	16164 bytes
SHA-256: `fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467`
`font_03_sfnt_off00013364.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13364	16900 bytes
SHA-256: `8cc003485d013aa7cde16ad65f8b61c63edf44c1d580c90b6cd38c080fbb8911`

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