PDF malware analysis — malicious · 72e54a061d68bf43

MALICIOUS

PDF

76.4 KB Created: 2021-07-09 02:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 2bbd721edb3cd2a4596f8e5fd193557c SHA-1: 119222bea0951bf15bd96ee5c6f7030d63ac4fc6 SHA-256: 72e54a061d68bf43b2a39895dbf3c515222733c01bee023ced4d32a2968518bd

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. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to host further malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true malicious destination through a large number of links on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://irinaburmistrova.ru/files/81758641684.pdf In PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/804752401d734bbac572a1ec0056ecfa/67046968176.pdfIn PDF document text
- https://bloomland.com/sites/bloomland.com/files/gazixeposupofujusadopazox.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a72ec17b7---woxafivodoruveledi.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9a78ac9e8---wugusuku.pdfIn PDF document text
- http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcd5fc214d---wasaxirupe.pdfIn PDF document text
- http://cuiquji.net/d/files/45464742746.pdfIn PDF document text
- https://asharfilalkulfi.com/ckfinder/userfiles/files/51947645981.pdfIn PDF document text
- https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/u857fvtaakjh4fr6vqerqoc1fd/80069958652.pdfIn PDF document text
- http://acmemask.com/upfiles/editor/files/23838218235.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dce7dc048fc---vuzedewuxulativavobe.pdfIn PDF document text
- http://studiolegalezullo.eu/userfiles/files/xomisoxenepusesugiz.pdfIn PDF document text
- https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/42lsoj53h9sm030re0mcvponof/reduvoruzavorofujupira.pdfIn PDF document text
- http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c02531f478---wolusiginaribanuput.pdfIn PDF document text
- http://industra.sk/userfiles/file/44903228666.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9357d295---1754211601.pdfIn PDF document text
- https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/803eobtspi964ai9earhkb5oue/navenuzuxi.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e9db9b8a---seneloxib.pdfIn PDF document text
- http://yule-sign.com/upload/editor/file/20210603044608.pdfIn PDF document text
- https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/f8d7c858e47dfabac1d6fddef6e2b520/turizesegi.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e2fc151bc57ebf200b9ae40682d39be4/15731823026.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a21a636fc8---4617326948.pdfIn PDF document text
- https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d479ac176087939288e5d79365f43eba/25350869194.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907ce19e50f---4752322327.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=jee+main+question+from+trigonometryPDF 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_off0000c5a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5A5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ddb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDB7	17316 bytes
SHA-256: `5e98be41ff19ab547cf1206f725e770a2faa20a483776827673823b8112aefc6`
`font_02_sfnt_off00010b5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B5C	10860 bytes
SHA-256: `008e3423b4d3810ec11969ac538a151213a64c043726fd40c710e0915c393260`

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