PDF malware analysis — malicious · aed1649bf1ce8899

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 10:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c268ee9714973d631c511a14335a773a SHA-1: 52f94743bc02fe252c2329fc4c89ce1aa8c87a81 SHA-256: aed1649bf1ce889957a5ea180e2de03115cdc3c18037ed5b97cfdf535fccf6d6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://artstudiodesign.it/userfiles/files/tiwisuxixumugusujoxez.pdf In PDF document text
- https://sjamsul-hidajat.id/ck_uploads/uploads/files/fofisukojuzo.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe628118c---tewonufe.pdfIn PDF document text
- http://heatherjansch.com/ckfinder/userfiles/files/41639903336.pdfIn PDF document text
- https://consultemergingmarkets.cubsindia.com/files/49635273303.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2885c2d1228010133595d5e9ed82b796/31186812213.pdfIn PDF document text
- http://s8radziejowice-paszkow.pl/userfiles/file/34571179125.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613424c7b8ce6---rolukojan.pdfIn PDF document text
- http://sake-tori.com/images/library/File/11259010367.pdfIn PDF document text
- http://thai-apsproducts.com/file_media/file_image/file/kakenazo.pdfIn PDF document text
- http://samurairamenbar.com/uploads/files/sudelafasepojafirixelina.pdfIn PDF document text
- https://immo-cjeanpaul.lu/userfiles/files/pavuxujetedewumemajefi.pdfIn PDF document text
- https://bjjewels.net/nbloom/fckuploads/file/kasufivupigu.pdfIn PDF document text
- https://hotellemaritime.com/hotel/upload/files/nuxavujigiri.pdfIn PDF document text
- http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/26367461574.pdfIn PDF document text
- https://sofupingame.net/calisma2/files/uploads/70230612167.pdfIn PDF document text
- https://nanyangtextile.com/userfiles/file/gimupuwafuxuxu.pdfIn PDF document text
- https://hitourkorea.com/FileData/ckfinder/files/20210908_EFB657029A404061.pdfIn PDF document text
- http://vikohasanfiber.com/upload/files/dokijisivofodaxad.pdfIn PDF document text
- http://aygroupmuh.com/image/files/28149110281.pdfIn PDF document text
- http://msslink.ru/userfiles/files/78693045574.pdfIn PDF document text
- http://iphysiology.ru/upload/xosebegelogekaxisika.pdfIn PDF document text
- http://marleenjansen.nl/images/uploadfiles/67395862986.pdfIn PDF document text
- https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bomidisusujed.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=prokaryotic+eukaryotic+cellsPDF 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_off0000ca4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA4B	10424 bytes
SHA-256: `13666979ff547f682a9c8271a743d2d49540d7bdf8aa868e86d2c4caa70e46f3`
`font_01_sfnt_off0000e220.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE220	19356 bytes
SHA-256: `5d5f3d6144d86f9f820684ffc7d134a41ebcbb32586aa4296509aac68e6c4fcb`
`font_02_sfnt_off000114e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114E8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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