PDF malware analysis — malicious · b43c72c970ffc839

MALICIOUS

PDF

102.1 KB Created: 2021-09-09 10:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 5ef4a94d5be58d44ecdcee46f7d7055f SHA-1: 023464100ebca505608e2ba3d312f1e9ac9fb989 SHA-256: b43c72c970ffc8390c0b42344b9a21968fc6f8614186c5d190409ef01da00958

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=nights+at+the+circus+pdf PDF link annotation
- https://alzubidi.com/userfiles/files/18841551954.pdfIn PDF document text
- https://tapetcenter.ro/app/webroot/files/userfiles/files/zikubesilo.pdfIn PDF document text
- http://fosterfreezesantarosa.com/uploads/files/88142898170.pdfIn PDF document text
- https://pchome.uzai.ca/upload/files/lakuxoribexibivisodu.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7c2ddf902cc0cb83958f07daf051041e/1749698186.pdfIn PDF document text
- https://pasarangroup1.com/contents/files/dexenamepebenupazaf.pdfIn PDF document text
- http://93564497.com/userfiles/50250006449.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ca4f08f1---53996924715.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-9-3/20210903075026664753.pdfIn PDF document text
- https://grandhotelbulgaria.com/userfiles/file/3307045837.pdfIn PDF document text
- https://durgabas.coop.np/ckfinder/userfiles/files/lisux.pdfIn PDF document text
- http://choragwica.pl/userfiles/file/42084886837.pdfIn PDF document text
- https://zivotzaokny.eu/res/file/4912780968.pdfIn PDF document text
- http://worshipedia.net/sites/default/files/file/61371449681.pdfIn PDF document text
- https://agri-mal.pl/userfiles/file/powovifubawinonunu.pdfIn PDF document text
- https://senarathgroup.lk/assets/media/file/1918561446.pdfIn PDF document text
- http://congseng.com/uploadfile/files/56272565927.pdfIn PDF document text
- http://ambulatorioveterinariovianello.eu/userfiles/files/46219885817.pdfIn PDF document text
- https://gabconstruction.com/ckfinder/userfiles/files/44577515266.pdfIn PDF document text
- https://samowar.me/upload/file/dofejodefutosu.pdfIn PDF document text
- https://pasarantogel.com/contents/files/runexixufeveboj.pdfIn PDF document text
- http://thietkewebsite.btccorp.vn/uploads/files/roxaganexi.pdfIn PDF document text
- http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161394de736f42---beniwesaxise.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
`stream_004_off00014451.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x14451	10708 bytes
SHA-256: `d4998b4fd7611d07b0cb89c82a4b370af89e0c5f0892bde8878d30e18a6690e9`
`font_00_sfnt_off00012c3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C3A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00015cd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15CD4	17588 bytes
SHA-256: `572e3a2f59713f269416781da7065d5704a45a4b4095b9644dd0920618adce8b`

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