PDF malware analysis — malicious · 875c5f40049693a0

MALICIOUS

PDF

90.6 KB Created: 2021-09-05 17:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 012c1a9ae72c09405f2672fbc6f465d2 SHA-1: 70fab8764234719152315299c9955f530f21b475 SHA-256: 875c5f40049693a06715e5bf431e15e8c94ce6b0c13ae71ec87acd7c074c83ea

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9744

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://seoulsquare.com/userfiles/file/21407334360.pdf In PDF document text
- http://chukysovin.com/img-svc/files/pukabokibemet.pdfIn PDF document text
- http://kme-kme.cz/files/file/pakogegewifasuvunofinogu.pdfIn PDF document text
- https://veaodaibrahma.com/uploads/image/files/zexoxuruwazokufizo.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f683ec1104---dixutiliwarinabe.pdfIn PDF document text
- http://metaglas.kr/userData/board/file/luxilelobevadogasazuwovew.pdfIn PDF document text
- http://allycatering.com/userfiles/mufunavitinawexev.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fea4ea2e2---37331031004.pdfIn PDF document text
- https://phuketwebstudio.com/ckfinder/userfiles/files/71684316554.pdfIn PDF document text
- https://naucharts.com/ckfinder/userfiles/files/lizatepefasonajeluwaxu.pdfIn PDF document text
- https://msvadba.ru/files/file/rugowetefokobew.pdfIn PDF document text
- https://pasarantogel2.com/contents/files/jaraneze.pdfIn PDF document text
- http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/begajarudi.pdfIn PDF document text
- http://capitolmetrophysicaltherapy.com/files/files/7357497727.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102d729b8dda---lirumufinomubikenag.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612b477d69b40---benukogawogutaxezowifawa.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f7925ad7d8---werawiwonadewatasemuko.pdfIn PDF document text
- http://ybshajiang.com/userfiles/file/2021-07-24/210724003433445311if0x6acr0rup.pdfIn PDF document text
- http://namjapizza.com/app/webroot/files/25148141788.pdfIn PDF document text
- https://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/lapojekog.pdfIn PDF document text
- https://asiantms.com/ckfinder/userfiles/files/97722206200.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c0c25e9cfbe5c60e9eebf7cad1fa6b6f/72042568222.pdfIn PDF document text
- https://ratsimae.eemedia/contents/file/doporemikonoziroganekexe.pdfIn PDF document text
- http://haphadoor.com/upload/files/54882775136.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f80987fbf---juzefanurawugokevoviza.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b2b4b5f4e5041268ad684ab4c1174993/86730791858.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cloze+test+short+tricks+pdfPDF link annotation
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off0000debc.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xDEBC	18428 bytes
SHA-256: `517aa455bdc3c70bcc8a9488d58267106f5bb05fbb1cfd0cbeabed53ebf0bd0b`
`font_01_sfnt_off0000fc9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC9B	18264 bytes
SHA-256: `57e210a4e1abc900e0efe79fa434b3ded40cee96273f6b78779c0920e90a06f0`
`font_02_sfnt_off00012b42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B42	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00014359.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14359	10632 bytes
SHA-256: `1c3bb736d422e838141b81f868db8e7d5c8ed7f8d428c5ec0408b776dea46d2b`

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