PDF malware analysis — malicious · c509fe86307116d7

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 05:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b6cabeaea4b066f7d2af7b46672d2dfa SHA-1: 76f09508bd741055f35b44f7f370da93af35e0c7 SHA-256: c509fe86307116d7cd96ab7ed0fc6ce7b148acecb30bed27ccef39e70937d01c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a phishing or redirection scheme. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of a link farm on potentially disposable hosting further supports a malicious intent to redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://houtackers.nl/userfiles/file/21343385685.pdf In PDF document text
- http://giovanninociti.com/userfiles/files/nomutopixiwuvelowanek.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161360f348e3db---duvumup.pdfIn PDF document text
- https://organicfertilizerproduction.com/d/files/noramizoziwidasudawok.pdfIn PDF document text
- http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210908133557.pdfIn PDF document text
- https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/xajakigolavefiralegim.pdfIn PDF document text
- https://remini.hu/userfiles/file/77021697521.pdfIn PDF document text
- http://kencert.vn/uploads/image/files/lufaremuzetarafokevavomos.pdfIn PDF document text
- http://pumarecovery.com/userfiles/files/jibiwif.pdfIn PDF document text
- https://electroagro.es/pub/files/68207256455.pdfIn PDF document text
- http://trustarshida.co/cache/fck_files/file/37173552597.pdfIn PDF document text
- https://cheeselicious.net/UserFiles/file/80460528708.pdfIn PDF document text
- http://denetimmusavirlik.com/userfiles/file/62671020619.pdfIn PDF document text
- https://corianderedmonton.com/ckfinder/userfiles/files/kenitavikipufip.pdfIn PDF document text
- https://comfort8889.com/upload/files/31182671275.pdfIn PDF document text
- http://www.louisianarebarcontractor.com/editorimg/file/2494102167.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16132ff89f05ca---9927143111.pdfIn PDF document text
- http://gewald.ru/content/Files/metelu.pdfIn PDF document text
- https://buildingexpertsdirectory.com/ckfinder/userfiles/files/jonijekixafejo.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315958c338c---4478464643.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe64b70e71---wavufixunoroguvabulofot.pdfIn PDF document text
- http://itagqatar.zajeltel.com/itag/file/files/zasikulivogifox.pdfIn PDF document text
- http://studiotecnicoprato.eu/userfiles/files/wugipiwisowu.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161307b2fc8709---39978066106.pdfIn PDF document text
- http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa57e368ac---lonubizado.pdfIn PDF document text
- https://megatex.ua/images/uploads/file/xigis.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=der+kleine+prinz+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d7bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7BC	10464 bytes
SHA-256: `7f10b0ec87ee49da497cb0180f00f9f7b85dee2a93fc9fa4288f632acf0000fe`
`font_01_sfnt_off0000efa0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFA0	19592 bytes
SHA-256: `8d03299b6f0a0f73e38589049bb222d6f0f4ddfa597bc717990e48d944a3b466`
`font_02_sfnt_off00012202.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12202	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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