PDF malware analysis — malicious · 26442137b9a154c6

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 20:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: ba85df0a3e24bb4c5914098f536bc61c SHA-1: 1ee87bb09c24133688ffbef132b2639cc26b64f7 SHA-256: 26442137b9a154c6aa4f0b2689cbcdcaf671279a791c6ee481ad20d3517d9a20

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fazolerem.pdf In PDF document text
- http://www.dawnrotaryclub.tw/UserFiles/files/vufabawafirofo.pdfIn PDF document text
- http://keramann.ru/uploads/files/zoxagalefen.pdfIn PDF document text
- http://mmprogetti.it/userfiles/files/86483726160.pdfIn PDF document text
- http://neza.cz/UserFiles/File/74573497964.pdfIn PDF document text
- http://puisan.ru/uploads/file/65989489924.pdfIn PDF document text
- https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/90697395157.pdfIn PDF document text
- https://butagallery.com/userfiles/files/dujamuje.pdfIn PDF document text
- http://tinavaron.com/ckfinder/userfiles/files/29840744257.pdfIn PDF document text
- https://jagamimpi.info/contents/files/60075233239.pdfIn PDF document text
- http://lidaoxc.com/upload/files/32841269865.pdfIn PDF document text
- https://ritascreation.com/userfiles/file/jibozozezatosi.pdfIn PDF document text
- https://felicitareonline.ro/ckfinder/userfiles/files/woxaganamanolajerameja.pdfIn PDF document text
- https://milosislandrooms.gr/userfiles/file/bumikabopazoneguwij.pdfIn PDF document text
- http://photo-preiss.com/upload_files/files/lexetonawuxop.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9gscu41d2a2cnacd33iqc8ubd9/36394201454.pdfIn PDF document text
- https://transilvaniafishing.ro/app/webroot/files/userfiles/files/tunevaso.pdfIn PDF document text
- http://ruizhishengwu.com/uploadfiles/file/071730079872.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613428e4d6b33---gosuropirupot.pdfIn PDF document text
- http://englandmatchshirts.com/assets/file/niwenuwogoxebatazu.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e7e83976---wunaxejinokolok.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143500dda335---woluwegabomav.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7fdb4f20f---65314041242.pdfIn PDF document text
- https://noursportevents.com/wheelmarine/userfiles/file/88916106019.pdfIn PDF document text
- https://akconta.com/uploads/files/80956003651.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=endgame+free+streamingPDF 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_off0000de48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE48	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f65f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF65F	10516 bytes
SHA-256: `4bd7317e297587c76193483574936092e936842ed4b4f43edbe1364aec3a3725`
`font_02_sfnt_off00010e06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E06	17024 bytes
SHA-256: `03f9e8032990d0d165063d590f1ff7842311c4491286c60ee5c2ae7bc987d67a`

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