PDF malware analysis — malicious · 9b5e70241e50449e

MALICIOUS

PDF

81.3 KB Created: 2021-07-02 08:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 1fb4db8fe988a953317560b1a85c7498 SHA-1: 179513f03a43f8e1fface0efe51221ae2f34e17a SHA-256: 9b5e70241e50449eea3d99b946587a65064be3a805b32669c355ea042af1c444

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it contains links to numerous external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The PDF structure and embedded links are consistent with a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://krisoc.ru/uplcv?utm_term=fe+other+disciplines+review+manual+pdf+free+download PDF link annotation
- http://aep-tc.com/cache/fck_files/file/luvegafezewosanapit.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c12988c4c23---xamufimavagefokovo.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c7877730d---93111539584.pdfIn PDF document text
- http://www.moyekolodin.com/files/bofodizowovititemuvul.pdfIn PDF document text
- https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/13nrhf03q2amv9rmhka868k1ne/duxujufe.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093da9a5b619---7968002055.pdfIn PDF document text
- http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608866e46c3d7---wuverawetoj.pdfIn PDF document text
- https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1da3009508be8634b2f48e66ff0383a4/nujupipoxizigexivuve.pdfIn PDF document text
- http://chiangmai-clean.com/user_img/files/35245846827.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j4cc8rp4168qp6bde1ckstie17/vokewa.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/nd1k3lf6qnsh4cs1rtnl8qj716/nokobanatika.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160840ad32d6e5---jaxifeleki.pdfIn PDF document text
- http://trendybiz.in/usersfiles/file/84336315462.pdfIn PDF document text
- http://caratow.eu/userfiles/file/fuduw.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/m1ba3gu4ndvja6ltap19mffooe/dewedafekafebifofalideb.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a2i6qb02ehlqdh4id8eri1k2rq/17174160555.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/g9t65u6ntom95olqdp6qt584na/rigumogufiza.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab649d352f---56042532993.pdfIn PDF document text
- http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lebhriuauepkbe46ols4udklq5/navininejopiraruzatedej.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c631fbccc1f---livajinolelinilif.pdfIn PDF document text
- https://ijpdua.com/contents//files/kewimagibo.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160816c5a7286d---guzinogovakobezesufadumeb.pdfIn PDF document text
- https://pjkconstruction.ca/images/file/88363037073.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765670d2289---xagewegukixujibesugube.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/63d7dc464c8d53786ba4d42ab1646cdb/62067104980.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c76c70054---xuzujajimutadawukugow.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_off0000d914.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD914	17248 bytes
SHA-256: `3d6693b22c20b0769333e91af51704e9e4e4a67a508d1293d24386a891f4f3e4`
`font_01_sfnt_off00010574.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10574	11112 bytes
SHA-256: `d792811e986b0b54e3eb9957c03a7614e2136f42ff3f05cda567470ffb4e1fbf`
`font_02_sfnt_off00011f3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F3A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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