PDF malware analysis — malicious · 40a7da8a4bb02e43

MALICIOUS

PDF

91.5 KB Created: 2021-06-26 21:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: ea89bd5e56b70c42658dd2e50a7dbcab SHA-1: e3bb0d4a2d764878e9c2ee84c1b6202a8c6325b5 SHA-256: 40a7da8a4bb02e43c5e8294aaf10728ef882a1d16d9f620dc02fdce6609ee268

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9866

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://costabravas.com/uploads/localidades/files/fodubidez.pdf In PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16090c7a49069e---zalapufuwot.pdfIn PDF document text
- https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/2b1ad3d970642910c3d7ca7e7c5fbc85/febutejera.pdfIn PDF document text
- http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/84007547005.pdfIn PDF document text
- https://actor-conseil.com/files/file/73043488581.pdfIn PDF document text
- https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/qvpa0bcb90nf9bhqp4iflumgme/bewasi.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f127e055fd---vufaz.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/u2i84brn8s0d1ic9cqt51uivv4/lapejesom.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f721f60349---8762743213.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aeb1b55a5---44056196165.pdfIn PDF document text
- http://mppscstudy.com/admin/usercontent/file/bokanegabokozuxexa.pdfIn PDF document text
- https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea47e6f90f---mokisepamesejejevoduzorid.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/nuxurotitinowazasuv.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/jd51ia2cpkelubgv5kdf23b3o1/69115318479.pdfIn PDF document text
- http://rszm88.com/upfolder/e/files/20210531002852.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086099abe704---22012818289.pdfIn PDF document text
- https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3hi164v8a3n5sej54mo11f8i0d/rometenatik.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b12cd151---fadabekixamuxi.pdfIn PDF document text
- http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160756e9b84876---4009236727.pdfIn PDF document text
- https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/01b7166b2b0aae5efd7d5e3f19482c38/63232622313.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e0ee9228ebf32b839aa67db8b7f84fbc/97018224658.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787fbf73f31---susofafolaruwevig.pdfIn PDF document text
- https://activepymes.com/pub/file/4345586279.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sodden+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off00013f30.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x13F30	18724 bytes
SHA-256: `e088cc7218abbf0e13f3b44bd1ef5661e35ca80928b4eaea957a6b034876c292`
`font_00_sfnt_off0000c142.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC142	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d954.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD954	25164 bytes
SHA-256: `e8726e10e1e8d778a6827306f0304a20a39845b8c7fefde2ce3d38c19d784b9b`
`font_02_sfnt_off00011507.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11507	5024 bytes
SHA-256: `7b14a10cd206613c3725ec05efdb5750ced5c62683e615a2cb408979a5642b4f`
`font_03_sfnt_off00012794.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12794	10572 bytes
SHA-256: `70ddac14558033c07dbbc7dab0614e8bc2f909939dd1e1e859a1ef00e1314dac`

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