PDF malware analysis — malicious · b0aa91ac2ae24ea6

MALICIOUS

PDF

89.5 KB Created: 2021-09-02 14:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fa31eef3e74dd16659b1d04e1ca914e0 SHA-1: bc692b442a8d490b9ab7d902df3829605a3537cf SHA-256: b0aa91ac2ae24ea6c1c61fc8b0170d706e68335881fdbaaf3a2f6bf401201ad8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The primary purpose appears to be redirecting users to potentially malicious content hosted on these compromised domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9933

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://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/37f2c6d192de1efbe409a0907e5ae588/29507712811.pdf In PDF document text
- http://9275522-travel.com/userfiles/file/pidezowopaxajovimazome.pdfIn PDF document text
- http://choinka4x4.org/cms/files/file/zudosawiguzinikokimo.pdfIn PDF document text
- https://beytarimcilik.com/admin/editor_resim/file/28468651240.pdfIn PDF document text
- http://alternatifmedikal.com/img/userfiles/files/nujebax.pdfIn PDF document text
- https://sona3elkhair.com/userfiles/file/fidujof.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/befd14e4167d97be9176f74aeab9e85e/89094578749.pdfIn PDF document text
- https://soechi.id/userfiles/file/sufaze.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51ed4727b---7265736418.pdfIn PDF document text
- https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b069c064a7c---61595316147.pdfIn PDF document text
- https://mahae.hu/files/files/42900495016.pdfIn PDF document text
- https://macauroommate.com/ckfinder/userfiles/files/69855495567.pdfIn PDF document text
- http://alimentosldm.com/userfiles/file/43815124171.pdfIn PDF document text
- http://yizhu580.com/ckfinder/userfiles/files/52836218418.pdfIn PDF document text
- https://aronabritcan.com/userfiles/file/92827979995.pdfIn PDF document text
- http://at2apigroup3.com/contents/files/88336390591.pdfIn PDF document text
- https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/k8p7qkh2983mp4bct66997c2ta/80004424709.pdfIn PDF document text
- https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d37a8acd761cea1465ec4b02c86ba9e0/14792805933.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/734a4944e4f75bc9b4ac98f9a09a6c94/kizoxe.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7662061d7---53761856443.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607018ceb9e14---zobezajotifokivedowafixez.pdfIn PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7aaf6d549---9451469182.pdfIn PDF document text
- http://chemtron-vostok.ru/media/file/towonofawedokolefej.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607deca56e5d0---98620386112.pdfIn PDF document text
- https://aptitudeclass.com/ckfinder/userfiles/files/zawolafezixir.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=noun+printable+worksheets+2nd+gradePDF 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_off0000df42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF42	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f759.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF759	11184 bytes
SHA-256: `3cae46cf8282032022e5172e30101fe0994a707b5c059c90457a211b5a773ea5`
`font_02_sfnt_off00011123.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11123	17192 bytes
SHA-256: `736bad5b1f990d62aed4ecf6620ce51020afb900679dca4ee8c145c7c85029fb`
`font_03_sfnt_off00012a46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A46	17600 bytes
SHA-256: `4646505d98756cee7f0852c6df15a639b20d517f32c1c64a6039ba311742871e`

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