PDF malware analysis — malicious · ce101a81a9edfc83

MALICIOUS

PDF

82.1 KB Created: 2021-07-19 18:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d596dcfa21d52d5f08ee817ed8df0950 SHA-1: 205f59c38a84291edd6b5fd96011b615c21746be SHA-256: ce101a81a9edfc83de782eca765b0ea182c5817df61565108b7decb115304fd1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to lure users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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 http://vigova.com/Images_upload/files/19158805937.pdf In PDF document text
- http://eventclub.pl/userfiles/file/85526140280.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd450b8dd---meretagejarixik.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607387881a56d---67165775106.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8266a1312---muduwul.pdfIn PDF document text
- http://dailitara.lt/bites/uploads/file/335800601.pdfIn PDF document text
- https://langumeistras.lt/i/File/fujesowubefo.pdfIn PDF document text
- http://midel.me/userfiles/file/32554949427.pdfIn PDF document text
- http://abwmarlboropike.com/uploads/files/20169194959.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1e687289---29256818817.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/035ae663923833611a2867a4ccbd8007/57698067390.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094186a43461---63384615215.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f5d2cced502b6685d033cdfb3db0541/32355836818.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd19582e55---81997617964.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f022eea2---dunebikefufilewawisozon.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160866be753e41---92377687370.pdfIn PDF document text
- https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/dscm9temvfjctlfs1vcalq6n7i/fotawijevibifonon.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/78fe6e6fd4a05fc5bb866e6b42af7981/53353613024.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c740144eec---rosejixilivukifenikud.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3fc00cd0---9428775160.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608d16b4cea4b---637910796.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6hr65lmivf913ofe1f6hn38dn8/67575619549.pdfIn PDF document text
- http://derma-dts.de/files/file/33018414123.pdfIn PDF document text
- http://dilimkebab.com/userfiles/file/60930386606.pdfIn PDF document text
- https://bilalyapidekorasyon.com/userfiles/file/30485412095.pdfIn PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f02e479489---vujazonajo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+fonts+onlinePDF 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_off0000e1c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1C6	10024 bytes
SHA-256: `597031f8d55c1b1f8acbfba6fb49df4c50896f32a2a0663751ae507c578be91a`
`font_01_sfnt_off0000f81c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF81C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001102e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1102E	16532 bytes
SHA-256: `4eda06a1dcfbce448de674726c3e9c25db9e574158189e7905ceb4c4f4a422f3`

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