PDF malware analysis — malicious · 0c368ec47ead7544

MALICIOUS

PDF

90.4 KB Created: 2021-06-29 23:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: bafed55d53df7bda13c1c57b5ca36c94 SHA-1: 54358953d47bf790b8fdadb0a4bfd3ebf702dae5 SHA-256: 0c368ec47ead75447aa67b8f2546fe9c33f2fd0e87c04f57f62880654b1cb13b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The document body was unreadable, but the heuristics strongly indicate a malicious intent to redirect users to external, potentially harmful, URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://synerhu.ru/uplcv?utm_term=thevenin+theorem+problems+solutions+pdf PDF link annotation
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc84a274c---libuna.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39921c834---56327469249.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8671678b70---8690866335.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9dae1de8---78260813873.pdfIn PDF document text
- https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/931b3bfee5062b7d6fd183b1f1ef640b/lafuduwago.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2841e163d4---48532285025.pdfIn PDF document text
- http://progfin.pl/userfiles/file/35416282960.pdfIn PDF document text
- http://kolasinprevoz.rs/slike/files/magewawuborag.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6b6d418a---zuguratazepirukogizasi.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087636b2561f---54982923707.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a6195424e4957e6b7c7b73a924c8fc28/69506748779.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c026ca869---75546425375.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fdcc26782514091c1506fdb3d4de6c31/retoxavofizar.pdfIn PDF document text
- http://from.ua/upload/articles/2021/06/14/files/48660484794.pdfIn PDF document text
- http://tanriovermensucat.com/uploads/genel/files/rowiveletabulojuwogub.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609535e529a18---28753589668.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8200b2adc94dc4042a206eeea2605d00/89420666679.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a9ad066ed---nanagafog.pdfIn PDF document text
- https://jancsoalapitvany.hu/ckfinder/userfiles/files/77530216638.pdfIn PDF document text
- https://bedandbreakfastchia.it/userfiles/file/laguxaz.pdfIn PDF document text
- http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1857ff80---57161858843.pdfIn PDF document text
- http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa03692ab---93766446319.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/33e90412113ec008cf422a1828579fc0/93417588528.pdfIn PDF document text
- https://davaocarrental.com/images/file/gifokazurufiben.pdfIn PDF document text
- http://cdmvt.cz/sites/default/files/wijuwuwajiru.pdfIn PDF document text
- http://hongdanhaudio.com/luutru/files/51623848785.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_off0000f9e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9E7	10868 bytes
SHA-256: `a775560864fb45df4d9a1cdb864a2433962b406be911a7111913ec3e19afa665`
`font_01_sfnt_off00011295.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11295	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012aa7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AA7	18912 bytes
SHA-256: `fe51efa1ea20f5124e45b6f6bc561e45d3ec31b2bc0006007546ccef1510dc09`

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