PDF malware analysis — malicious · 3197031d8cacc006

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 19:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: f294cb5102afff88ca60e1b699292276 SHA-1: 2b91d385b1aba13648a6939780e9e5ae2c9f1bc0 SHA-256: 3197031d8cacc006e73eabeaf38f186eb71790dd5f7e0354dcd5822a724d224f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the presence of a link farm suggests the PDF's purpose is to redirect the user to external malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=wap+in+games+for+android PDF link annotation
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332fc73c986---8073955507.pdfIn PDF document text
- http://deltools.com/userfiles/file/44938559518.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9dde9d675d15903f5f7ec31f99e08e1f/25596056176.pdfIn PDF document text
- http://hengtongrongshang.com/jingkelun/userfiles/files/20210910132146.pdfIn PDF document text
- http://gandolfiarchitetti.com/userfiles/files/99367494645.pdfIn PDF document text
- http://lacasedescaraibes.fr/file/25739544534.pdfIn PDF document text
- http://triple-a.co.th/ckfinder/userfiles/files/52994741432.pdfIn PDF document text
- https://thegioidongphuc.net/ckfinder/userfiles/files/80760340717.pdfIn PDF document text
- http://happinessgown.com/upload/users/files/6621065536.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341963e1267---mufekoweza.pdfIn PDF document text
- http://www.kroonzuivel.nl/ckfinder/userfiles/files/totekij.pdfIn PDF document text
- https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ce705b634753020a14b5f80ffd69b45e/77138218382.pdfIn PDF document text
- https://asiapharma.la/files/files/vubulikekinamekolet.pdfIn PDF document text
- https://sunridgecorp.com/uploads/files/202109090410408426.pdfIn PDF document text
- https://kapokcmassage.com/uploads/files/202109100615236604.pdfIn PDF document text
- http://merrygoldholidays.com/ckfinder/userfiles/files/95419472074.pdfIn PDF document text
- https://drisraadentalcenter.com/userfiles/file/saguxinibemuxa.pdfIn PDF document text
- http://psychologadamczak.pl/userfiles/file/susimerovatomidi.pdfIn PDF document text
- http://miyagi.chi-kara.net/Upload/files/50519062569.pdfIn PDF document text
- https://burlingame.com/wysiwygfiles/file/besevuxebotetisepagonogad.pdfIn PDF document text
- https://hiperaktivite.info/userfiles/files/15511682140.pdfIn PDF document text
- http://thesnowmanicecream.com/ckfinder/userfiles/files/47957106592.pdfIn PDF document text
- https://zhansq.cn/upload/file/karumusizibovemepupiniku.pdfIn PDF document text
- https://aarhuskortet.dk/images/file/53794284890.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_off0000de0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE0A	10688 bytes
SHA-256: `ffcae86a9075ead6466f7e8b9b1b209fae519a437bbfc70af421eeedb625e737`
`font_01_sfnt_off0000f64c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF64C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010e5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E5E	17496 bytes
SHA-256: `7d0214c0ed9a06af1f25a7b629285e6f72be0e2c26902b54bbedb7e09c2bd253`

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