PDF malware analysis — malicious · 83b36ff42e26082f

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 00:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a20d8838032c81705da75ac4d9acfdd2 SHA-1: 391bf043fd52f8ab2f76a2d21747a560cb4eaec0 SHA-256: 83b36ff42e26082f5bc139836f75283da77dd0bc6fd1b0649e95270383e4b7cc

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous embedded links pointing to potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to malicious URLs, likely serving as a first-stage delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=will+i+miscarry+again PDF link annotation
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e41adb8f---94431426422.pdfIn PDF document text
- https://walnutcreekguide.com/wysiwygfiles/file/29457587774.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/dfdeb724cd43279a27e44c14f033e09c/tukawanojumanageletifaz.pdfIn PDF document text
- http://leoclubmarsala.it/userfiles/files/kasubus.pdfIn PDF document text
- https://cosplay-expo.it/ckfinder/userfiles/files/27803164021.pdfIn PDF document text
- http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/fotikurumodezafijabaw.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/hes412mhlq78shu8htgg6do4jr/marimajadabamurelijujej.pdfIn PDF document text
- http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/judagewodofasibozuwubeni.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abaa50c3dc2---nipavivuboderak.pdfIn PDF document text
- http://the-bom.kr/upfile/files/gazotenemonemezijineza.pdfIn PDF document text
- http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/4310474523.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/68667969977.pdfIn PDF document text
- https://avela.md/userfiles/file/7510447616.pdfIn PDF document text
- http://techbis.pl/files/file/gapumunenuvamuvumanimad.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce2ee67eb---64131233586.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba60e6e2e85---25571617434.pdfIn PDF document text
- https://zapcdn.space/web/img/podborky/files/97821546521.pdfIn PDF document text
- https://go2germany.ru/files/file/sawumekonofejeza.pdfIn PDF document text
- http://xn--eyt274i.com/upload/files/watotidaxonofirap.pdfIn PDF document text
- https://hanurichurch.org/ckfinder/userfiles/files/47749758236.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16071f90a69ae2---jibuxusasatakub.pdfIn PDF document text
- http://ahxxzx.com/userfiles/202104/file/84915732203.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3a37179b3---toxix.pdfIn PDF document text
- http://augustaelectricalwork.com/editorData/file/6454245689.pdfIn PDF document text
- https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/2b1e25d93e223f48406a43b939a8b8df/pexesemilegivonaza.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_off0000f41f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF41F	16856 bytes
SHA-256: `77b4404ca9032d65b71c09be20a7b0afb030d72eac67c0801598b09d4a5f6bd7`
`font_01_sfnt_off00011ffc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FFC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013813.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13813	10328 bytes
SHA-256: `24828cb907c216ff3d0f9abe2b32b700a5b749bbb0362c682c37448900066279`

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