PDF malware analysis — malicious · d1497165a1648658

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 21:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: b03ee158b51710d9dd9fffb5f276b343 SHA-1: 61ba81a76fb9535a77a009dbbd6efe432bac6e6a SHA-256: d1497165a16486586e2cbe649628eab2cd679cbe8e4a1fcdf7e23687d96c016f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farms on disposable hosting further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

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 https://krisoc.ru/uplcv?utm_term=how+do+you+sign+hello PDF link annotation
- https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b2d5f2cb7---67380829654.pdfIn PDF document text
- http://bukvoznaika.ru/ckfinder/userfiles/files/jisobozuloga.pdfIn PDF document text
- http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/radufi.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161565f6527754---kolorisebedifasiroza.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161406905e14bd---5381475535.pdfIn PDF document text
- https://sapsda.org/SapmaUserfiles/file/24921278077.pdfIn PDF document text
- https://exam11.menapoint.com/app/webroot/upload/files/93600415245.pdfIn PDF document text
- http://hanifeugur.com/image/files/jupekot.pdfIn PDF document text
- https://szpital-sulecin.pl/images/fckfiles/file/tawufi.pdfIn PDF document text
- http://vincentianssjp.com/userfiles/file/9337730805.pdfIn PDF document text
- http://0975811252cool.linker.tw/files/jeruwokovovatuka.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d0969d2e2ddac0e0d6de12dedc214599/dumufedalefitifebano.pdfIn PDF document text
- http://uticachemical.com/files/upload/files/veximojim.pdfIn PDF document text
- https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/fakafarawujifeboginigu.pdfIn PDF document text
- https://sharjahcements.com/images/bulk_images/files/60793970981.pdfIn PDF document text
- http://www.pacautomarketing.com/file/616962225.pdfIn PDF document text
- http://triatlonbizuterie.cz/sites/default/files/file/jixoliwijar.pdfIn PDF document text
- http://miskolciharsona.hu/pictures/file/momigugoruliwi.pdfIn PDF document text
- http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/foseda.pdfIn PDF document text
- http://cc-loges.com/uploads/file/pexefuvifatuku.pdfIn PDF document text
- http://kartywspomnien.pl/uploads/assets/file/8699369539.pdfIn PDF document text
- http://itineraire-consulting.com/ckfinder/userfiles/files/61278951776.pdfIn PDF document text
- https://eirai.org/editor/ckfinder/userfiles/files/rogidevedikexida.pdfIn PDF document text
- http://drumlockingclamp.com/FCK_Editor_Images/files/88249768619.pdfIn PDF document text
- http://bumsnab.ru/uploads/files/bifugugalawujawezu.pdfIn PDF document text
- http://baldonimarcostudio.eu/userfiles/files/nafudemotilazukitexi.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_off0000b240.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB240	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ca57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA57	10456 bytes
SHA-256: `59df1b619371b5ca0b127e8d38c9010faf3d54bac80490bc4558d1f63bffcfd2`
`font_02_sfnt_off0000e1be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1BE	16124 bytes
SHA-256: `a0cbe4ef7f5a8393d2e3cb9042e630118a0741fcecbfdb02559ab87aa86e8a2a`

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