PDF malware analysis — malicious · adda1f3951123fd7

MALICIOUS

PDF

74.3 KB Created: 2021-09-24 16:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a4d5900cc1ba7311ea388db82ff13658 SHA-1: f8ac8b021a2ea3c3eea91fe1ba5aac126e6749e7 SHA-256: adda1f3951123fd7a19727ae73ec4ab8cfd78672c06e01c8e984ab1673ff7c45

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites. The presence of links pointing to compromised WordPress upload storage and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious intent to redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

Heuristics 6

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.
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://inwebjor.ru/uplcv?utm_term=super+vpn+app+download PDF link annotation
- http://kursadowicz.pl/Upload/file/gufozivukatok.pdfIn PDF document text
- http://dabaizhongxue.com/upload_fck/file/2021-9-14/20210914022123375520.pdfIn PDF document text
- https://anfauglir.com/images/file/mezuketisa.pdfIn PDF document text
- http://thietbiotoviet.com/Images_upload/files/popedefasog.pdfIn PDF document text
- https://villamishkan.com/310renonew/front/images/files/gixebujesonoraz.pdfIn PDF document text
- https://inarsindbari.org/uploads/febapa.pdfIn PDF document text
- https://gegeny.hu/uploads/file/5448085764.pdfIn PDF document text
- https://habibitours.net/ckfinder/userfiles/files/25237977900.pdfIn PDF document text
- https://otterdisplay.com/userfiles/file/92806832608.pdfIn PDF document text
- https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/gijabewerepuxisap.pdfIn PDF document text
- http://teamhead.net/userfiles/file/rujivumademasasu.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16142c2276b460---fawisipiwidatejabafuvige.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/06f2284c47a1538d1f1c0055a1cc71f8/23908285127.pdfIn PDF document text
- http://jmk.kr/ckfinder/userfiles/files/tizazaxokuse.pdfIn PDF document text
- http://scuderieverdina.it/scuderia/userfiles/file/42270150100.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a299a8c7e9f11a837ac4fc05c10dafd7/13230801138.pdfIn PDF document text
- https://dehayemek.net/upload/ckfinder/files/7560073588.pdfIn PDF document text
- https://groupunsur4.com/contents/files/37668738409.pdfIn PDF document text
- https://valeaflorilor.ro/img/uploads/file/868471855.pdfIn PDF document text
- http://royalrep.com/userfiles/files/6588921983.pdfIn PDF document text
- http://www.77ice.com/upload/files/56195511782.pdfIn PDF document text
- http://investbuild.ru/var/upload/file/10220523561.pdfIn PDF document text
- http://weddingdove.tw/uploads/files/202109170838533463.pdfIn PDF document text
- http://www.dawnrotaryclub.tw/UserFiles/files/vopufoxunugu.pdfIn PDF document text
- https://yourownadviser.com/ckfinder/userfiles/files/59018132448.pdfIn PDF document text
- http://hcm-invoice.vn/hinhanh_fckeditor/file/fefupezu.pdfIn PDF document text
- http://elisa5888.com/shopadmin/upload/files/7614940565.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_off0000baf8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBAF8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d30f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD30F	10356 bytes
SHA-256: `dd5aff916379a2713910e6fef3037d02948201e872d5ff3a0f3cd5e270c6034e`
`font_02_sfnt_off0000ea95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA95	19076 bytes
SHA-256: `1b1d065fddca006df06dac5c1989907a43073adb1578e16f04a908bac565df2e`

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