PDF malware analysis — malicious · d293e54f21090c51

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 11:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 0c324c2f99c7a44b47c4c9fd502f442a SHA-1: 0f65e500d8f581dfe612140b021a9896b66229ec SHA-256: d293e54f21090c5101408dd3e56490e3a7c10d76e39e54b8e9417e9423e42d77

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The file's structure and embedded links are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.8943

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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=real+housewives+of+beverly+hills+season+10+putlocker PDF link annotation
- http://prospekt-rostov.ru/ckfinder/userfiles/files/mewipafadifotamamipez.pdfIn PDF document text
- http://epilia.com/upload/FCKEditorfile/weruzasalubakujosas.pdfIn PDF document text
- https://k31szmq42-nu28.com/contents/files/rosolivurelatalikasuzuten.pdfIn PDF document text
- http://jobsandhi.com/uploaded_files/userfiles/files/putidosukup.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa89ad62df---42536611099.pdfIn PDF document text
- https://theptaynam.vn/upload/files/81342189921.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eu1a5nobrqv63oe4iqt8vndjp/4242919640.pdfIn PDF document text
- https://granitnet.hu/editor_up/wenaxim.pdfIn PDF document text
- http://tagsu.com/attachments/fckattachments/file/jidigaliwawarukuwebuw.pdfIn PDF document text
- http://hongsung114.com/files/fckeditor/file/55193610791.pdfIn PDF document text
- http://seasonsblinds.com/uploads/ckfinder/userfiles/files/2218277224.pdfIn PDF document text
- http://paulabenveniste.com/UserFiles/file/fodorozabewokokuxakun.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161421c1636cc9---nadoxeviruremur.pdfIn PDF document text
- http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/26555859550.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613053fe96d6f---75279812631.pdfIn PDF document text
- https://bacsionline.net/userfiles/file/xetasovewuxesu.pdfIn PDF document text
- http://dastone.ru/userfiles/file/20154290936.pdfIn PDF document text
- https://unitjaya.com/contents/files/xakolapokax.pdfIn PDF document text
- http://gorsilawfirm.com/userfiles/file/85512702681.pdfIn PDF document text
- http://remont-etalon.ru/upload/files/xosuwowawox.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3867f2e3af366e8445bfc686d65497aa/13752289042.pdfIn PDF document text
- https://www.thc.gda.pl/ckfinder/userfiles/files/zutagukifusojinuw.pdfIn 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_off0000df25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF25	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f73c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF73C	11396 bytes
SHA-256: `d1ecce00bcb9b3a4b869ccd06b53123bc9800ed4a2da73a7d8a5130b9528ebb7`
`font_02_sfnt_off000111fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111FE	19496 bytes
SHA-256: `c5c83a787625758004c88da800c64d426bb9032542e23c3364efeb2e8ba9ec30`

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