PDF malware analysis — malicious · 01c33dd15fae71d9

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 08:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: b722fef5007696cc2d5fffd6a374e005 SHA-1: ff2b7df8211575abdf7a79d76454fd5c537d763c SHA-256: 01c33dd15fae71d9a359e06d78b294e4acd314a2e25d28ac9ed3a4c99551c3f6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of links.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

Heuristics 5

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=lampstand+ark+of+the+covenant PDF link annotation
- http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b8520bffe---64392214408.pdfIn PDF document text
- http://ahlhy.com/uploads/file/102132584628.pdfIn PDF document text
- https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c733f9480f---13951636221.pdfIn PDF document text
- http://araonline.hu/uploads/file/bonizodabalupunagoxijota.pdfIn PDF document text
- https://istanajpdua.com/contents//files/kugijobofufama.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/e6c8t5dqh5q0aqr3amcdarnbl6/49067780516.pdfIn PDF document text
- https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/26df99a5b1ae01d7b9cc175c791ca95e/6369495668.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/83af72e4043f6f83e92b7da4bc6d814d/lojuvidu.pdfIn PDF document text
- https://airshow-bg.com/file/8629492747.pdfIn PDF document text
- http://onestudent.dk/userfiles/file/redukoxufebowaka.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6b79fd7ceeff5e82a868c579f6db2f9c/91870080602.pdfIn PDF document text
- http://massageindex.nl/images/uploads/53362389764.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/dfe2e5103230b9110323eba28feee608/juzalowolimugufuxofakir.pdfIn PDF document text
- https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c1e210c5da93e46b29cdff0acf65a4a5/kukudo.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9946de9fa---50601717949.pdfIn PDF document text
- https://nezrenpin.com/calisma2/files/uploads/revagep.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818639aced4---wogebawotojiwazurojesu.pdfIn PDF document text
- http://icsbc.ru/fuploader//file/79349739446.pdfIn PDF document text
- http://aftckwt.com/uploads/file/boginabazufanititipa.pdfIn PDF document text
- https://its-bulgaria.bg/files/file/61703632709.pdfIn PDF document text
- https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719f531efe5---97444668377.pdfIn PDF document text
- https://fertilizergranulatorprice.com/d/files/4360261999.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/9c9a3e7459cb1499822a5dfdd8e4f5d2/66014738466.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa670d5456d---xuxosapavuxotato.pdfIn PDF document text
- https://avgdesign.com/userfiles/file/teboxo.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d53378d01d---fafafuzoxevoj.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88088fd0d---kuzemalopebetop.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
`font_00_sfnt_off0000fab0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAB0	10864 bytes
SHA-256: `a7817f29f6b5217a52f1f571fffe13c13a4d255a548d78b9e5594667f7498e8e`
`font_01_sfnt_off0001139f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1139F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012bb1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BB1	17204 bytes
SHA-256: `1b196c63acd52b5a11b43a474edb02539dac6e63b924f31010bd395b5607d310`
`font_03_sfnt_off000158bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x158BF	3076 bytes
SHA-256: `8e9c32d1c9da80fb98f15dfeef4562d5202b976ebc95e7b403088f1b276bd0a6`

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