PDF malware analysis — malicious · 7c42af1a8a2b255b

MALICIOUS

PDF

86.0 KB Created: 2021-06-25 21:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 73d374189dbc4635ea66a28859a1aadf SHA-1: d06050fe0f973300d192d506fc321413270858b8 SHA-256: 7c42af1a8a2b255b562ac6b428875d88483ef10aa1ba2bfc74f85029c3cb56ec

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 https://smidgel.ru/uplcv?utm_term=knee+pops+when+walking+down+stairs PDF link annotation
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c5a59e4b7454ce9d0703657577e9bdf5/37125796579.pdfIn PDF document text
- http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609109c7ad1b8---giwitatasixolov.pdfIn PDF document text
- http://songhandiban.com/uploadfile/file/2021062403140773499.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3cc6d613da02ce5270b52b49dc23c026/49921485710.pdfIn PDF document text
- https://aydin-elektrik.com/resimler/files/10061373025.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/c0qjibbqrbj47rqd3moflcpteo/tatad.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/15468838777.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b284f37cd58---24292365294.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/60d4d5ac3282e17c45ad62c2677c985b/79080591162.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/t3q9pv9b7h3uqca241n41c2u0s/50585906109.pdfIn PDF document text
- https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed06c05f1d---86443175934.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7a8fcfu7t42uvatqrcp3t6qiah/zexubiroledofa.pdfIn PDF document text
- https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/10e9e2a02182c4ceff39b0ac0bdf53a4/vipuvedoxogedogalageve.pdfIn PDF document text
- http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f6385ba3b---64897015530.pdfIn PDF document text
- https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/836273255e26f02734c2e2f64ea14a6a/maxupaginebera.pdfIn PDF document text
- https://asthasupermarket.com/userfiles/file/98060955605.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/oktq3tt7jj37nppnebipua57v0/bojesaboku.pdfIn PDF document text
- https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ismrrhj24j75js9eo6ru0gvha1/niwufepenoza.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b554fda89b8---xixasoperapeto.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083271ca567c---16583553702.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae44e15911b---kujopenotakilunilili.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a52e8789---34777043238.pdfIn PDF document text
- https://planet-for-events.de/userfiles/file/36363481629.pdfIn PDF document text
- http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/047ababe072e878ad40d45ca6995e2c5/bemeto.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_off0000eebc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEBC	10840 bytes
SHA-256: `7e72bd0307cbb03023bc592ff46e713d3ed5885560a5e4796077ad94230425ad`
`font_01_sfnt_off00010789.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10789	16708 bytes
SHA-256: `571cb30faec1db4d4ff4f80d62553379140ebd91c1ecd7e90a5b183304f66556`
`font_02_sfnt_off0001329a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1329A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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