PDF malware analysis — malicious · 83d3006e33f31e7e

MALICIOUS

PDF

72.4 KB Created: 2021-09-05 03:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 9c54857cbf0391a3d0f9d67d19bb1d61 SHA-1: 93f9ec5de41bc767010f3c51e3eb5f968854f779 SHA-256: 83d3006e33f31e7e0f66e929b6e845eb274449f562dc1e6c388696f37cc1fba9

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 identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection as a Trojan indicate it likely serves as a dropper or phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9837

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://gazetavk.ru/img/file/nomavudusegefelajurid.pdf In PDF document text
- https://biogenetixpharma.com/ci/userfiles/files/xudogij.pdfIn PDF document text
- http://gotween.com/userfiles/file///22924343258.pdfIn PDF document text
- http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821a279ce4a---gozixijebawawo.pdfIn PDF document text
- https://hoavily.com/uploads/files/11243710531.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2e452db11f36369fd7d6a0e67965d4b7/96081770178.pdfIn PDF document text
- http://fioredda.com/userfiles/files/famiso.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2678aa128---likogedijiwonazetij.pdfIn PDF document text
- https://anjingliar2.com/contents//files/99334502916.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2a234e9cc914ba4e8a6c8fef5821bd11/90558059290.pdfIn PDF document text
- http://nhasachconggiao.com/luutru/files/wuwur.pdfIn PDF document text
- http://dok-vo.ru/userfiles/file/vetamige.pdfIn PDF document text
- https://wcfkenzi.com/ckfinder/userfiles/files/furuboxogomuramosoxog.pdfIn PDF document text
- https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076215443afb---48561504189.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e50a4f05---853396046.pdfIn PDF document text
- http://zeroseistudio.eu/userfiles/files/gakabivefixakixovumu.pdfIn PDF document text
- http://kunjipsc.com/uploads/files/jofitixejiwuredavitekidal.pdfIn PDF document text
- http://kuhomania.ru/ckfinder/userfiles/files/bovonafujenoneraxukuzuk.pdfIn PDF document text
- https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc8a5584fa---jafimejepawipom.pdfIn PDF document text
- http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/26ea71ddb4516178fb8ec464c0dfff9f/rodepukizoroxefikujusaji.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0426ac7491---bevelu.pdfIn PDF document text
- http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/58264503935.pdfIn PDF document text
- https://pelletier-tp.fr/ckfinder/userfiles/files/32034241733.pdfIn PDF document text
- http://nemdanangpho.com/uploads/2021-07-01/images/files/gakedatalegekigijur.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ac7bd815a6---tuzinipilokumavo.pdfIn PDF document text
- https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/38ac8cdf0004732772ff281ab178d0b7/xojono.pdfIn PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/of3v41ouar2l81rb59g30atn8g/zadexediwup.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=quadratic+functions+vocabulary+pdfPDF 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_off0000b7a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7A9	16644 bytes
SHA-256: `82b13b6140cd67932d1fff1168e468d76ef1c59208065fcbbb5d4bce9f08c625`
`font_01_sfnt_off0000e245.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE245	10960 bytes
SHA-256: `d6f1c5029ba65eb1b14f73da8134adc7d43a1970b657bbfae19c75644dfc5b63`
`font_02_sfnt_off0000fbb8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBB8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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