PDF malware analysis — malicious · f6244796caf7d8be

MALICIOUS

PDF

84.2 KB Created: 2021-06-27 19:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 3528ffa5c14a7cc415996272d00542d7 SHA-1: d9d8823a5d5a26de899300651c6ae4eed0fa9971 SHA-256: f6244796caf7d8beb9ac2942f213848bd5fe439b0728a61e2eb20b9da4a29456

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055 Process Injection

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites, indicating it's likely part of a link farm used for phishing or distributing further malware. The presence of these links suggests an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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 https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e1fdaade38e1703b84208d2c6a361f54/karivakux.pdf In PDF document text
- http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfcb208c3---90518879889.pdfIn PDF document text
- http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/40520785896.pdfIn PDF document text
- http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/jagokarobezenawevejulox.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4389b71f7---44009344230.pdfIn PDF document text
- http://phdpecs.hu/userfiles/files/93077300108.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cd3cdb39---xutotorizisimap.pdfIn PDF document text
- http://texmet.pl/userimages/file/26369086695.pdfIn PDF document text
- http://guowangcable.com/d/files/41996568451.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096956d3a919---13030343869.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607001e8ecd4e---44690572184.pdfIn PDF document text
- http://elcampoeco.org/FCKeditor/file/24585526843.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5027f351509bc4764ef394651e590364/8034181623.pdfIn PDF document text
- http://www.hermosabeachbungalows.com/userfiles/files/miwidituwivijarunikifo.pdfIn PDF document text
- http://faxik.ru/ckfinder/userfiles/files/37013869572.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c487513805---90210814894.pdfIn PDF document text
- http://rld-carbon.ru/file/fanofanojosawogezumona.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/4805452576.pdfIn PDF document text
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9sv61gc0fa6g83q1dl16jbg4io/matudumabusuxulususepefi.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/54243f38da8ed7fd26e41782de5e62da/suxikuzufepudalofe.pdfIn PDF document text
- http://fw-simple.com/uploads/files/wijen.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1jdrk2pfp6gs7a76li0uif31o6/56107645464.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745b54b50e8---7337712500.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/22ibgsmaofqi9io6uq3j0pkth9/48050332813.pdfIn PDF document text
- http://ztkammer.at/uploads/file/16322902999.pdfIn PDF document text
- http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8f3onkk0agc3lfrf63sa578l73/sawokuxax.pdfIn PDF document text
- https://anukulagrotech.com/userfiles/file/54329245109.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=slogan+about+environmentPDF 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_off0000e595.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE595	17248 bytes
SHA-256: `79307bfbd711371438211d9798dfafdff1c55ccdb48445dac635b33590f17409`
`font_01_sfnt_off000112b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112B3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012aca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ACA	10664 bytes
SHA-256: `aebe8d2ae71789d05e054c44511436f150af391841f7fa66dd7369afeaaa2d9e`

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