PDF malware analysis — malicious · ac1cd8bfc09db6e9

MALICIOUS

PDF

99.6 KB Created: 2021-09-04 22:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 31a975cf9f47c666135f4f098c54cf93 SHA-1: adab6d07ce9eafd476cce8f04edf7284e85a0a1c SHA-256: ac1cd8bfc09db6e94b9381ac434950a28f1e92b95b88c31b0a5937128529d3ac

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

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://irlanc.ru/uplcv?utm_term=hmrc+residence+domicile+and+remittance+basis+manual PDF link annotation
- http://insidethedigitaltrend.biz/userfiles/file/13006689750.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18062f6a3---vutixasideluz.pdfIn PDF document text
- https://tarsiman.ee/files/file/16470048626.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/75e349d21962a413bea57224ce06909d/kobegopipajoluzuj.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161267bf7eae33---27128467493.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad5db920f---74057129176.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4635e143e5---34856249760.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610943914c948---tusafipirudowi.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10296072b0---gepedidotosoxebipepu.pdfIn PDF document text
- http://sneedfamilyct.com/clients/44919/File/gozoziwatozujanepevala.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd535888db---48274856848.pdfIn PDF document text
- https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ml1blqommckm09utvmnjdnbear/kinevaloda.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/j1f3cg7lmkldiffdk55stetlbs/jopuwalilijotabu.pdfIn PDF document text
- http://akwarella.pl/user_uploads/file/39217154357.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/5389142070.pdfIn PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6491c8690f---zowudiforonuf.pdfIn PDF document text
- http://cerrutistudio.eu/userfiles/files/57130269779.pdfIn PDF document text
- http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/bexomilo.pdfIn PDF document text
- https://iskoruma.com/upload/ckfinder/files/kijurubalunotageropumepil.pdfIn PDF document text
- https://sibconsulting.com/contents//files/pamap.pdfIn PDF document text
- http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/aeaccf728f7b46716f0fd91c60cc84f0/komevifabuvabamupu.pdfIn PDF document text
- https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/2de269cb1a0c5ff8461a45aefda9794f/64685596108.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jhijo3d2imediko1r9ds1thbtv/13293625378.pdfIn PDF document text
- https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/fosonixakivamomusarux.pdfIn PDF document text
- http://labotinnghia.com/img/files/31620460318.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0462848ac---gumadoxomixe.pdfIn PDF document text
- https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/06258f7672e5afe28d5f2670d6677f20/wipigutinotara.pdfIn PDF document text
- 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_off000120be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120BE	17880 bytes
SHA-256: `e5b8827cd7b323829334cff2abae5be7c8d1bd366ea0c741504f8a5dd139e8dc`
`font_01_sfnt_off00014f4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14F4F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00016766.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16766	10760 bytes
SHA-256: `83b25048abcc48b09b071fb559ff61c2a782839053c63b15aa2bb90b86506385`

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