PDF malware analysis — malicious · de5465dbcb841e92

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 01:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 328c79cffc840df33f206beb54161265 SHA-1: 60bd04ef8996097a7a3047726ad56441f3e9b5c4 SHA-256: de5465dbcb841e92acd93bbcc667c4d18d9696b478f8f7756bd1d13b4c79f9ad

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/uplcv?utm_term=top+apps+2021+android PDF link annotation
- https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ee2d0df3fbe4fc5679537c85efa7b366/42481827958.pdfIn PDF document text
- http://www.alcera.ca/userfiles/file/kalifomuriguxizekag.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/do7lkbgk1c7uno5ec5t5tda3u6/ruwoxovoxizufugadad.pdfIn PDF document text
- http://nitecoreromania.ro/files/file/xunexagonasasofexowa.pdfIn PDF document text
- http://axwelindia.com/uploads/36094302081.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614080f8de068---pupizotiw.pdfIn PDF document text
- http://kco.su/userfiles/file/mavudamukunadopuletel.pdfIn PDF document text
- https://kabelkyaobuv.sk/editor_uploads/files/4156243098.pdfIn PDF document text
- http://ayrh.internet-match.com/upload/files/siwulaxinupi.pdfIn PDF document text
- http://yangpupark.com/uploadfile/files/nubowisitaguvokevi.pdfIn PDF document text
- http://cheniou.handysociality.com/upload/files/loporuzutobij.pdfIn PDF document text
- http://myagreement.com/UserFiles/file/53862769062.pdfIn PDF document text
- https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/tubasedove.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613443827ff37---gebisezimuzapopi.pdfIn PDF document text
- https://robodom.si/files_vsebine/kifaroduriwuve.pdfIn PDF document text
- https://betsin.org/userfiles/files/12470607482.pdfIn PDF document text
- http://lauraestetica.com/userfiles/files/tegetogix.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_off0000b48c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB48C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cca3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCA3	10368 bytes
SHA-256: `b74a1f80b6bbedf437e7f43af61b0013c555809e679475100d2b857e9372cfb5`
`font_02_sfnt_off0000e431.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE431	16728 bytes
SHA-256: `02db053f46a522f73f793f0d0761437b7f0d19f3374a0046b1c52da9f5bc7e9e`

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