PDF malware analysis — malicious · 5581c5b8e0796d9f

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 09:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: aed7f73e89c566e2a321bb4f0aa32644 SHA-1: d9b34c42097b7c23f0bf4aef69a9b2854e73cfb5 SHA-256: 5581c5b8e0796d9f92ccb4a753bf364d163fbc2d490911bb60c16bcfb3ff69ac

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised CMS upload directories. This suggests a phishing or redirection attack aimed at leading users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://rockpapersun.com/upload_mce_image/file/25523927945.pdf In PDF document text
- http://kxnjl.com/userfiles/files/97905838523.pdfIn PDF document text
- http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/rijabizafutaxakigoziwupes.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136be8a55dfa---11529877518.pdfIn PDF document text
- https://littleitalypizzany.com/nbloom/fckuploads/file/49441093991.pdfIn PDF document text
- http://www.northern-japan.com/image/upload/File/33836040977.pdfIn PDF document text
- http://dogable.de/userfiles/file/65543188750.pdfIn PDF document text
- http://hieuchuan.com/upload/files/rufavesofoxi.pdfIn PDF document text
- http://jnejendomsdrift.dk/userfiles/file/2815693292.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea3119f632---kibaluxor.pdfIn PDF document text
- https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/55b70e1136cc96c603529008e5b42286/83327031310.pdfIn PDF document text
- https://vnycc.com/userfiles/file/90015770405.pdfIn PDF document text
- https://xn--49st2et51duvk.com/upload/files/mexajaxazuveruxowizodilu.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f123be36af---pewogujutedesitopezizebim.pdfIn PDF document text
- http://massimobertoarchitetto.com/userfiles/files/jenajesewifa.pdfIn PDF document text
- http://ccsilver.kr/files/fckeditor/file/1483838814613882b090af1.pdfIn PDF document text
- https://drlalashow.com/php/billboard/uploads/file/pibogewepopolozirabozodeg.pdfIn PDF document text
- http://shipagents.nl/uploadfiles/file/69589370549.pdfIn PDF document text
- http://historia-bfured.hu/userfiles/file/74247496907.pdfIn PDF document text
- http://iberryhomemade.com/userfiles/files/60633418225.pdfIn PDF document text
- https://candbco.com/ckfinder/userfiles/files/romaxitunadalasofifidapi.pdfIn PDF document text
- https://adtw1.elfjane.com/ckfinder/userfiles/files/78051184294.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b1b743bcbae576a35373f870ac69d56d/vibuzibetiza.pdfIn PDF document text
- https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/3250354644.pdfIn PDF document text
- http://ourconn.com/userfiles/file/202109130038174968.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=3d+modeling+software+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_off0000e0a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0A9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f8c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8C0	10856 bytes
SHA-256: `c26110a721262ed5d6105957e7a2f87abc7680969d36d10c9e27964f9d575fbb`
`font_02_sfnt_off0001119f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1119F	18332 bytes
SHA-256: `0217ec46e0d496bb71f844a7f00baea477de822d3ce896e90dd13bd23ecbe26f`

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