PDF malware analysis — malicious · 8aa28a3166e58358

MALICIOUS

PDF

96.6 KB Created: 2021-07-13 20:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 373b474c9c27e822126e2630491ac4fa SHA-1: 2f941269e26241c285bc294aa41a09364ec2c7b5 SHA-256: 8aa28a3166e58358a09a2739c0371bbb250735560e0e349a6e933958e0a56bd0

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. This structure suggests a link farm designed for SEO manipulation or to obscure malicious redirects. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and link farm heuristics supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

Heuristics 5

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://tvkinter.com/file_media/file_image/file/33332065991.pdf In PDF document text
- http://a-kamen.com/userfiles/file/94346767929.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/57562830158.pdfIn PDF document text
- http://castudio.eu/userfiles/files/5808794254.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/602c6ee6ce3a086cda22c05cf99b6b33/xomuju.pdfIn PDF document text
- http://www.groupementpecheduloir.com/ckfinder/userfiles/files/33919494260.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd57292b47---xokesef.pdfIn PDF document text
- http://madmojo.com/fckupload/file/fumerirukaxobepim.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2027811893a1f2cd6c8bacea31039c4b/20764060562.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608773735384a---dibivetunivibesoxuginipa.pdfIn PDF document text
- https://argekaucuk.com/nbg/upload/files/78620212568.pdfIn PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b6546e2b69a43e2aacc115c6d2b0a2d3/94661691047.pdfIn PDF document text
- http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/74547631956.pdfIn PDF document text
- http://allnatureint.com/userfiles/file/gaxegovuzo.pdfIn PDF document text
- https://beldapromosyon.com/calisma2/files/uploads/bapenutidusixaram.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c0b36aad---82008551688.pdfIn PDF document text
- http://hani-bee.com/userfiles/files/37066871526.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095456532256---pozaxarep.pdfIn PDF document text
- http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084689466725---jegefa.pdfIn PDF document text
- http://zulaikhatextile.com/userfiles/files/panevoledut.pdfIn PDF document text
- http://zbraneklapka.cz/ckfinder/userfiles/files/51812878837.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1f6da2002---34206502463.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=joan+marshall+the+munstersPDF 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
`font_00_sfnt_off000104bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104BD	10372 bytes
SHA-256: `a29189f41c2074c09d1bfad600908f766a48e52618a6821b15614f912dc1c59e`
`font_01_sfnt_off00011c03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C03	17332 bytes
SHA-256: `a303bdbedf05211d5590d65f0372eec0c6ace2ee9d4c809b2b44761e765a80cc`
`font_02_sfnt_off000148fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x148FC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00016109.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16109	5324 bytes
SHA-256: `6a1218bc9ad23fac4a908bb7f30b8aca25c2f8f201e02b2e812719be63ac347b`

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