PDF malware analysis — malicious · 28cfc93fd6a3a3b1

MALICIOUS

PDF

111.3 KB Created: 2021-06-30 23:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 5f6b0279665bf39df39fa5d36bef6211 SHA-1: 65b9b862ce77e470f3454e832a57afeed5025466 SHA-256: 28cfc93fd6a3a3b1c530d1b21cd5e0852247865fe03367973b4c13e1cdb3db07

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://bdsvieclam.com/upload/files/44702374215.pdf In PDF document text
- https://fcr-fomentoconsumoerenda.com/uploads/files/muvikupajelorevugu.pdfIn PDF document text
- https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/45f9008b68f5128fbab17e794034832b/wesedagolewufune.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/53ae12d5cc9977aa50cbe154bc226e94/95900637616.pdfIn PDF document text
- http://allaboutdowney.com/userimages/4329381704.pdfIn PDF document text
- https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2b5e028219dc3a241e5a96f45a65436e/kolesolak.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a2309880---21145701313.pdfIn PDF document text
- https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jenejlo97i7dsl95diei2otnca/79214604839.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u1kpargjhprusr1nnfs7c2r7j1/67995750229.pdfIn PDF document text
- http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075815819f4c---paresiguni.pdfIn PDF document text
- http://aftckwt.com/uploads/file/20348790728.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96aa6523e4---10640374905.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad4f458540---72472472980.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a181476bbc6d5482be4314b87332ef55/4435406818.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2d127dfb8---52267460367.pdfIn PDF document text
- http://guerrazzi.info/userfiles/files/93925609537.pdfIn PDF document text
- http://techbico.vn/uploads/image/files/33709514403.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hu20nonj8sg7a27c197ehlikbr/8778646263.pdfIn PDF document text
- http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e50e53ac9---bejifekemi.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e7bcef78---logisivijomo.pdfIn PDF document text
- http://agiusfuneraldirectors.com/files/file/98370643693.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099ae34b8d5e---daradipofajiwubekobijox.pdfIn PDF document text
- http://baschin-heizung.com/meineBilderAlbertGrundschule/file/14601199820.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40c17e4a5---nafotisudifirotifobiwo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=intercultural+competence+in+educationPDF 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_off00015075.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15075	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001688c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1688C	10560 bytes
SHA-256: `9144429a4b25ae48a4c3d7ec6e15d2e665ed6e0736f57d8a52583e361cf99655`
`font_02_sfnt_off00018083.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18083	18092 bytes
SHA-256: `bd5b73c67590c2a4f7675077994595b3bec3aac538f55fff9642cf3a2bf83c52`

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