PDF malware analysis — malicious · d7c1623632d28345

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 17:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: bf22296f40f08b261a4e9509c8cebe1c SHA-1: 6f00be219c893dddf6d905caa3807536d4c63c6a SHA-256: d7c1623632d28345f460b5ddfc446087e5ef1909b262e8e94d5dc16d06245f4e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect to phishing sites.

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://dilimkebab.com/userfiles/file/puzatuzigijuzujamo.pdf In PDF document text
- http://duszek-lasu.pl/userfiles/file/6315839328.pdfIn PDF document text
- https://kimcert.org/E/file/penitosu.pdfIn PDF document text
- http://countryclaim.cz/userfiles/file/85404121987.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141165316485---16736835625.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b95155361---ludenekakotawetotufiva.pdfIn PDF document text
- https://ms2oke.com/contents/files/sojot.pdfIn PDF document text
- https://lifecareproduct.in/ckfinder/userfiles/files/88524727133.pdfIn PDF document text
- http://okna-kursk.ru/page_edit/_samples/userfiles/files/9913950954.pdfIn PDF document text
- http://tostonet.cl/ckfinder/userfiles/files/zamagelufaretuxaselevab.pdfIn PDF document text
- http://www.biogreeno.com/cms/ckfinder/userfiles/files/77400928810.pdfIn PDF document text
- https://alpinebadmintonacademy.com/ckfinder/userfiles/files/61194744778.pdfIn PDF document text
- https://kampusogrenciyurdu.com/file/65777212538.pdfIn PDF document text
- http://6nergy.fr/6nergy/sites/default/user/file/93831736430.pdfIn PDF document text
- http://capthepcongtrinh.com/uploads/news/files/nigudaxog.pdfIn PDF document text
- https://bientannamhuy.com/wp-content/uploads/files/gabazu.pdfIn PDF document text
- https://condicionamentofisico.com/arquivos/file/22049138679.pdfIn PDF document text
- https://asiquim.com/ckfinder/userfiles/files/5982820779.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e8e8536ac---sogupiwof.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cdb1359b9---nobiwizowigunuz.pdfIn PDF document text
- https://wroclawmodelshow.pl/ckfinder/userfiles/files/maneminegawo.pdfIn PDF document text
- http://gemaeldeundobjekte.de/uploads/files/ratavadijeder.pdfIn PDF document text
- http://arabic.cz/ckfinder/userfiles/files/doxumuzakededenufatekux.pdfIn PDF document text
- http://acunambalaj.com/adenoto/upload/files/xugizulureremazog.pdfIn PDF document text
- http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37766481468.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=i+love+you+pdf+editorPDF 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_off0000e1f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1F0	10288 bytes
SHA-256: `93991370a357209d20781c6f225af0c2ca4a222c39169384665cf367f2b933e1`
`font_01_sfnt_off0000f930.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF930	17264 bytes
SHA-256: `5a87e02c53b352bf36294e606afb918687c70462739d04b5bec07f1ec2926148`
`font_02_sfnt_off000125d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125D1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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