PDF malware analysis — malicious · 8f6450ed677c654f

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 13:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: b42f598517542a59d3cd87e2ea968cb4 SHA-1: cd6525c25ee1b7353559cb532e14a0f206552b8e SHA-256: 8f6450ed677c654f5e30eb916505ee3ea667dc1a05810b5a9a4b9e849648991c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to manipulate search engine results or redirect users to malicious content. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common method for initiating malicious actions within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://huntic.ru/uplcv?utm_term=best+call+recording+app+for+android PDF link annotation
- http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tozofinif.pdfIn PDF document text
- https://upaspor.com/resimler/files/mabovoxomunuwiroz.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9fd612b9---wopuwekunuj.pdfIn PDF document text
- https://ms2oke.com/contents/files/nubalexinaluwanukomabita.pdfIn PDF document text
- http://king-tableware.com/uploads/files/202109071736079111.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b5d7dc06d29fda02e62d11fb2bfa9610/wopolexudode.pdfIn PDF document text
- http://epmresearch.org/userfiles/files/35835759556.pdfIn PDF document text
- http://adamslakeband.org/userfiles/file/mixupejakabawobororo.pdfIn PDF document text
- http://skkouty.cz/ckfinder/userfiles/files/jenoxavezujifetozudemi.pdfIn PDF document text
- https://fluffy-chins.com/images/file/2062826569.pdfIn PDF document text
- https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/bisilerupu.pdfIn PDF document text
- http://bielle-srl.com/userfiles/files/21288474854.pdfIn PDF document text
- http://peaceinsrilanka.lk/ckfinder/userfiles/files/mafotuzuxoniwufivobiwipep.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lodajudu.pdfIn PDF document text
- http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613491aec6c43---biruvexexataxubifexop.pdfIn PDF document text
- http://coniperfumes.cl/js/ckfinder/userfiles/files/raxisazilosirotaja.pdfIn PDF document text
- https://cplastik.net/data/cms/file/movifozuxemoretireke.pdfIn PDF document text
- http://bagliodeimille.it/userfiles/files/45233067577.pdfIn PDF document text
- http://cybernet-ap.com/UserFiles/File/3888024013.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137307312045---demadim.pdfIn PDF document text
- https://bongkartuantakur.com/contents/files/27895623446.pdfIn PDF document text
- https://sabunwangi.com/contents/files/vurife.pdfIn PDF document text
- http://dongbanja.com/userData/ebizro_board/file/6330599394.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_off0000dc3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC3A	10848 bytes
SHA-256: `a1f8057e9dc67ba7ae2a4148f6b728bfd828385e3d1d1bb2827436e488f5e198`
`font_01_sfnt_off0000f529.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF529	16804 bytes
SHA-256: `a481099abc275ed7c3074f476f2f3cb24b614a7bf6446c010e849e3f91459068`
`font_02_sfnt_off000120fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120FE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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