PDF malware analysis — malicious · c91ab3946061bf9a

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 04:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 881fb002ce756e0a4fd9b7237e1fc768 SHA-1: 471fd40c1769340eb012d408de5d624a105dba2e SHA-256: c91ab3946061bf9aaa9159b2197b67d73030b445e9a7d3b1c7ba70243c1aaf73

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, directing users to multiple external websites, some of which host further malicious PDFs. The presence of numerous links to potentially compromised CMS upload directories suggests a tactic to distribute malware through seemingly legitimate but compromised infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://gplacestracker.com/userfiles/file/9719115216.pdf In PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca0065c180---65750344186.pdfIn PDF document text
- http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6ee88372fef0193eccb30d90286591b9/73177422161.pdfIn PDF document text
- http://smclassof57.org/clients/34860/File/vumuvowu.pdfIn PDF document text
- https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/de11e9671dfcbaf5c2a6e732d8eee2f9/ropedibezo.pdfIn PDF document text
- http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/powasegu.pdfIn PDF document text
- https://ajitcoatings.com/uploads/xavinilin.pdfIn PDF document text
- http://catherine-massage.com/ckfinder/userfiles/files/21303656398.pdfIn PDF document text
- http://hanboo.cn/Uploads/file/2021072514523670554.pdfIn PDF document text
- https://abandassociates.com/ckfinder/userfiles/files/12188781039.pdfIn PDF document text
- https://anmoul.com/userfiles/file/40633108037.pdfIn PDF document text
- https://hondamienbac.vn/userfiles/file/15296385822.pdfIn PDF document text
- https://ovth.ch/userfiles/files/kalokuwukapuzad.pdfIn PDF document text
- https://areicon.com/images/file/59639538576.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd0d0ed17---64430688014.pdfIn PDF document text
- https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160eca41aabcda---vobibewipusilurum.pdfIn PDF document text
- https://techlan.pl/files/file/xurowezubirivijakopezunax.pdfIn PDF document text
- http://topnotchimports.com/ckfinder/userfiles/files/12919802936.pdfIn PDF document text
- https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d2cc79fc35cc4d09c4d01450521f4ee1/boruwedari.pdfIn PDF document text
- https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1578d74d4a4b67720fe38a600e057bc9/xurijekojutoraruro.pdfIn PDF document text
- http://sddshchb.com/userfiles/file/Fl202108120638109065.pdfIn PDF document text
- http://uzks.hr/upload/datoteke/54470821521.pdfIn PDF document text
- https://atlastoursntravels.com/userfiles/file/8137221324.pdfIn PDF document text
- http://rosesrealtyhomes.com/userfiles/files/26989750178.pdfIn PDF document text
- http://solyaris.pro/admin/ckfinder/userfiles/files/5972529238.pdfIn PDF document text
- https://xn--atpta-nfb.lv/images/userfiles/files/95609795305.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e9775ef6---92076570467.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sapota+is+good+for+weight+lossPDF 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_off0000ceca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCECA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e6dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6DC	18056 bytes
SHA-256: `3e27696bf934dd11ad1d47cc835c6de4d5d3c9b5bfc8a490c8d03655f2307fa3`
`font_02_sfnt_off000115b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115B0	10832 bytes
SHA-256: `d09dc2a4d17be621fa7b1f738463a6f6b66e78cbb32153f68539a8bf537ad1ae`

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