PDF malware analysis — malicious · c9a91fe6918f588b

MALICIOUS

PDF

95.4 KB Created: 2021-07-01 21:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 3916fae95c2d9e219d4a4fe35366f97b SHA-1: 228ad8bad9b83d231964591cfb5264112a445fdc SHA-256: c9a91fe6918f588bb229cd90532cc3399543b0b8a22b3a0672d21c15405a8235

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting other PDF files. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9817

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3972331d6---jebew.pdf In PDF document text
- https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jtah9pisa10qo8k0mb0rded4cu/51275070942.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6th6ug55lsn4phgtegt1qls1q4/raxonivej.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee7a367e4---fatezer.pdfIn PDF document text
- http://rafaelokazakov.com/file/65305561102.pdfIn PDF document text
- http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/38261521794.pdfIn PDF document text
- http://barudan.hk/UploadFile/file/20210616055126232.pdfIn PDF document text
- https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/kiof9ktb3b0jts5c1jjgdnkrp1/99626985303.pdfIn PDF document text
- http://buddhavehicle.com/userfiles/file/56658295352.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a928a101523---letuxopekotajazese.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd34438c113---nuvosozezebobarogufogi.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073c792a177d---69834513864.pdfIn PDF document text
- https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/k9ttpfh1g5lt595jk6ect52u89/fibazugotazepewileromupa.pdfIn PDF document text
- https://artbynela.com/uploads/file/83081593728.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923659aad19---35590332939.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/265c250013662c2bb6af781a1da050c1/72423017969.pdfIn PDF document text
- http://bhavalaya.org/ckfinder/userfiles/files/xomamoxa.pdfIn PDF document text
- https://chiataiec.com/userfiles/Proj_Name//files/zilotixukoxidi.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c23e1bbd692---31506690917.pdfIn PDF document text
- https://netshopnepal.com/userfiles/file/53028717094.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9ecbbc2d8b417b18170efe47f51ce237/xavowojo.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe62b8ff6c---48233442439.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/okm35589uk6k6bkunu46gt4lqi/dirabefafenozevonon.pdfIn PDF document text
- https://nevisnews.com/userfiles/11506516627.pdfIn PDF document text
- https://ises.ca/phpsites/vertical_living/uploads/file/59430758284.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ff0b35421---fifuwakijajimudib.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=yalla+shoot+live+english+commentaryPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00011588.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x11588	26120 bytes
SHA-256: `5dbed7052c0b4cf7a31bd9c03b151b61294cc4631a168416b86a92358bc7500f`
`font_00_sfnt_off0000e492.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE492	10840 bytes
SHA-256: `2c13bf65b54f80918a6a66c5d4b374507ff5fe93d029dcccc5e1c8068de10aa9`
`font_01_sfnt_off0000fd77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD77	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000143b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x143B3	16828 bytes
SHA-256: `02f0f27cafd0de7f63d0803dca116ecdadc7fdf17e3edaff728e53119ff4bee5`

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